Institute of Experimental Morphology, Pathology and Anthropology with Museum
Bulgarian Anatomical Society
Acta morphologica et anthropologica, 29 (1-2)
Sofia ● 2022
A N T H R O P O L O G Y A N D A N ATO M Y 29 (2)
Original Articles
Stunting is Associated with Low Birth Weight Among 3-12
Years Old Boys in Purba Medinipur, West Bengal, India
Pikli Khanra1, Kaushik Bose1, Raja Chakraborty2*
Department of Anthropology, Vidyasagar University, Midnapore, West Bengal, India
Department of Anthropology and Tribal Studies, Sidho-Kanho-Birsha University, Purulia,
West Bengal, India
1
2
*Corresponding author e-mail: rajanth2003@yahoo.co.uk
Stunting is a serious public health issue. It raises the risk of sickness in infancy and childhood.
Low- and middle-income nations, notably India, have been battling for years to overcome this
major issue, which is also connected to many socioeconomic and biological issues. However,
understanding the interaction pattern of undernutrition with these determinants is critical for
efficient policies and execution. Stunting (low height-for-age) in newborns and children is a
well-known and simple indicator of undernutrition. The current study sought to determine the
relationship among stunting, socioeconomic, demographic, and birth-related variables. The
research was conducted in the Haldia municipality and Deshopran block (West Bengal, India).
The participants were 291 (50.5%) urban and 285 (49.5%) rural boys aged 3-12 years. Stunting
was defined as height-for-age ‘Z Score’ < -2. Overall, 13.88% boys were stunted. Stunting was
significantly associated with low birth weight (LBW), controlling for all other significant variables.
Key Words: India, children, stunting, low birth weight
Introduction
Body height or stature is a linear anthropometric measurement influenced by genetic,
socioeconomic, demographic and dietary factors in a population [25, 33]. Stunting,
defined as low height for age (HAZ), is a well-recognized indicator of linear growth
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in children. A child is said to be stunted if the age and sex-specific z-score for height
is less than -2 [82]. The state of stunting was suggested to reflect a chronic nutritional
deficiency, often connected with socioeconomic and environmental adversities [3]. In
2016, an estimated 144 million children less than five years in low- and middle-income
countries (LMIC) were stunted [81]. In India, 38.4% of children were found stunted
in the fourth National Family Health Survey (NFHS) 2015-16. In particular, 28% and
34% of children aged less than 5 years in urban and rural areas, respectively, were
reportedly stunted in the Indian state of West Bengal [27]. Numerous studies have
already reported the prevalence (%) of stunting in India ranging from 10.9 to 55.9 in
boys and 18 to 58.4 in girls [1, 12, 17, 46, 62, 71], and in West Bengal [5, 6, 20, 43,
57, 64].
Stunting is considered to be a marker of the underlying processes responsible
for poor growth and other adverse outcomes both in early and later life [16]. Stunting
at an early stage of development leaves a long-lasting or permanent detrimental
effect on later life. Stunted children often experience delayed skeletal maturation
and usually become short adults and perform sub-optimal functions later in life [45].
Besides, it has long-term consequences on cognitive development, learning ability,
and productivity during adulthood [16]. It also leads to reduced immune functions and
increased susceptibility to infectious diseases. Stunting in childhood was also found to
be associated with a higher incidence of non-communicable diseases, such as diabetes,
hypertension, heart failure and other cardiovascular diseases during adulthood [10].
Stunted adolescents are often likely to develop overweight and obesity in adulthood
[33, 66]. Long-term follow-up studies on children from five low- and middle-income
countries, namely Brazil, Guatemala, India, the Philippines, and South Africa, found
that childhood stunting was linked to short adult stature, lower lean body mass, less
schooling, decreased mental functions, lower-income, and lower birth weight of infants
born to women who had been stunted as children [77]. Thus, identifying stunting at an
early stage in life could lead to improved population health in the long run.
Mothers’ health and nutritional status are closely linked with those of their
offspring. Children born to short women were at greater risk of mortality than children
having mothers of normal height. Infants born to underweight or stunted women were
highly likely to be underweight or stunted. In this way, undernutrition passes from
one generation to another like an inherited attribute [55]. Several studies confirmed
that poor height attainment due to undernutrition among women of childbearing age
had a greater risk of adverse pregnancy outcomes or intrauterine growth retardation
in the fetus [8, 77]. Low birth weight (LBW) and preterm birth are associated with
short height in mothers [22, 39]. About twenty million infants are born each year with
LBW, and many of them are from LMIC [74]. Moreover, the prevalence of stunting
has been generally considered irreversible and difficult to reduce in a recurrent process.
In childhood, women who were themselves stunted tend to have stunted offspring,
creating an inter-generational cycle of poverty and reduced human capital [58]. The
associations between poor socioeconomic, demographic and environmental conditions
and chronic nutritional deficiencies are currently well known [9, 12, 35, 36, 46, 62,
65, 71]. Increased risk of stunting has been associated with both poor socioeconomic
conditions and early exposure to adverse conditions, such as illness and inappropriate
feeding practices [36, 70]. The results of a large survey from India revealed that
undernutrition (indicated by anthropometry) was associated with birth-order, duration
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of breastfeeding, place of delivery of the child, wealth index of the household, mother’s
BMI and mother’s education in both urban and rural areas [34].
Apart from all those factors as described above, the phenomenon of undernutrition
may also have genetic mechanisms [18]. Stunting is a derivative of height, and the latter
also has a strong heritability component [44]. It was recently claimed that stunting
might not always be, or in every context, should be equated with undernourishment
in children [67], indicating that stunting might have causal factors other than those
responsible for undernourishment, in general. With the same dataset used in the present
study, it was already recently reported that low levels of mothers’ education in rural
areas and lower family income with poor housing in urban areas were associated with
a higher prevalence of undernourished children [35, 36]. Therefore, the present study
aimed to re-assess the roles of socioeconomic and demographic factors, the already
known contributors of stunting, maternal nutritional status, and birth-related factors,
particularly birth weight. We hypothesized that factors, such as birth weight, shall have
a significant effect relative to all other probable factors in predicting the prevalence of
stunting among boys aged 3-12 years.
Materials and Methods
Participants and settings
This cross-sectional study was conducted between December 2014 and April 2016 in
selected areas under Haldia Municipality and Deshopran Block (rural) areas of Purba
Medinipur district of West Bengal state, India. Among the 615 (urban: 307; rural: 308)
participants of the study, 576 (93.7%) provided complete information. Out of them,
291 (50.5%) were urban, and 285 (49.5%) were rural boys aged between 3 and 12
years. In the public education system of the state, children begin to attend the care
centers to receive a mid-day meal and some pre-nursery type education approximately
around 3 years of age. On the other hand, since the study was intended to restrict within
the preadolescent stage of the boys, the upper age was restricted to 12 years. A detailed
description of the sample recruitment procedure was described elsewhere [35, 36].
Data were collected from one rural and one urban area of Purba Medinipur District
(PMD). The rural boys were recruited from three villages, namely Kultalia, Sikdarchak
and Uttar Amtalia, under Desopran Block of Contai Subdivision of PMD and the
urban boys from three settlement colonies (CPT, IOC and HREL) and Rairarchak area
under Haldia Municipality. The study abode by the ethical guidelines as per Helsinki
Declaration, 2000 [72].
Demographic, socioeconomic and birth-related information
Demographic, socioeconomic, maternal health and childbirth-related data were
collected directly from the parents, in most cases, from mothers, through a structured
questionnaire. The information included social category (general- or scheduled caste),
place of residence (urban or rural), number of family members, numbers of elderand/or younger sisters and brothers, number of living rooms, house ownership, family
income, parental education, type of cooking fuel and dirking water facility. Information
regarding mother’s age at child birth, place of delivery, birth weight, duration of breast
83
feeding and infant’s age during the introduction of supplementary feeding were also
recorded. Information about birth weight and the age of introducing supplementary
food was obtained from the mothers. Low birth weight was defined as < 2500g of body
weight of newborns [80].
Anthropometry
One researcher (PK) recorded all anthropometric measurements from all children.
Height (cm) was measured for each child to the nearest millimeter, following standard
procedure [42]. Prior to the commencement of the main survey, one researcher (PK)
measured 30 individuals for standardization of protocol. The intra-individual technical
errors of measurements were computed [73] and found within the acceptable limits,
and thus, not incorporated in analyses of the main data set. Height-for-age ‘Z Score’
(HAZ) was computed to identify stunting among the children. The Z-Scores were
derived using the WHO Anthro 3.2.2 and Anthro Plus 1.0.4 software. Stunting was
defined as HAZ less than -2 [82].
Statistics
Percentages were used to report the distribution of the population according to
categories of different variables. Mean and standard deviation (SD) statistics were used
to describe continuous variables. Binary logistic regression (BLR) analyses (univariate
model) were performed for each independent factor to assess whether it is significantly
associated with stunting. In each BLR, odds ratio (OR) with 95% confidence interval
(CI) was calculated to show the magnitude of association of a particular category
of a predictor with stunting relative to the other category of the variables. Factors
significantly associated in the bivariate analyses were further included in stepwise
multivariate logistic regression analyses (enter method) to estimate their effects
relative to each other and to identify the most effective predictor variables, if any. In all
regression analyses, the dependent/outcome variable, namely, stunting was coded as 1
for ‘stunted’ and 0 for ‘non-stunted’. The predictor variables in the present study were
categorized as follow: social category (general or scheduled castes), place of residence
(urban or rural), family size (≤5 or >5 members), Number of elder siblings or younger
siblings (Nil vs. either or both present), number of living rooms (≤2 or >2 rooms),
house ownership (own or rental), monthly family income per capita (≤2000 or >2000),
parental education (both above secondary level or not), type of cooking fuel (smoky
or smokeless), dirking water facility (tube well or municipal supply), mother’s age at
childbirth (≤20- or >20 years), place of delivery (institutional vs. home), birth weight
(<2500gm vs. ≥ 2500gm), duration of breastfeeding (≤2 or >2 years) and infant’s age
on the introduction of supplementary feeding (≤ 6- or > 6 months). For each of these
predictors, the superior alternatives (such as, smokeless fuel) or the higher values (such
as birth weight ≥ 2500gm), were coded ‘0’, whereas the respective poorer conditions
or qualities (such as smoky fuel) or the lower values (such as birth weight ≥ 2500gm),
were coded ‘1’, respectively.
Family size, number of living rooms, number of younger and elder sisters and
brothers, duration of breastfeeding and parity data were categorized on the basis cut off
based on respective 50th percentiles. Mother’s age at childbirth, birth weight and place
of delivery and date of birth were confirmed from the vaccination record. Duration
84
of breastfeeding, the introduction of supplementary food and birth weight data were
classified following appropriate guidelines [80]. Mother’s nutritional status was
determined using body mass index (BMI) calculated as weight in kilograms divided
by height in meters squared (kg/m2). Based on BMI values, the nutritional status of the
mother were classified as undernourished (BMI <18.5 kg/m2) or normal (>18.5 kg/m2).
A p-value of <0.05 is considered to be statistically significant. All statistical analyses
were performed through SPSS-16 software.
Results
The overall prevalence of stunting among the boys in this study was 13.9%. Tables
1 and 2 present the percent distribution of the participants according to categories of
all independent factors as well as the significance of the association of each of these
factors with stunting through the results of univariate BLR analyses. The results of
BLR indicated that the risk of stunting was significantly higher (ORs = 2.53, p<0.05)
among the boys whose parents were less educated. Poor household income was also
significantly associated with a higher prevalence of stunting (ORs = 2.02, p<0.05).
Boys who were very low weight at birth were significantly (ORs= 2.70, p<0.01) more
likely to be stunted. Boys who had younger sisters and brothers were significantly
(ORs=1.61, p<0.05) more likely to be stunted. Boys delivered at home were more
likely to be stunted than those delivered at health institutions (ORs= 2.03, p<0.01). The
risk of stunting was also found to be significantly (ORs=1.60, p<0.05) higher among
boys whose mothers had less than 149.2cm height.
Table 3 presents the results of multivariate BLR analysis to identify independent
risk factors predicting stunting. Boys who were low weight at birth were significantly
(p<0.005) more likely to be stunted than boys who had a normal or healthy weight,
independent of all other potential predictors. Other factors that show a significant effect
on the prevalence of stunting in univariate BLR analyses did not reveal a significant
impact in multivariate BLR analysis.
Discussion
The present study showed a significant association of stunting with parental education
and family income when their effects were assessed separately. No other sociodemographic characteristic showed a statistically significant association. In contrast to
their higher levels, lower parental income and educational levels were associated with a
higher prevalence of stunting, respectively. However, this trend was not very surprising,
since the previous studies, based on the same data set showed that mothers’ education
level in rural children, and the family economic condition in the urban counterpart,
were the most important independent determinants of undernutrition among these
3-12 years old children [35, 36]. However, these studies used a composite index of
anthropometric failure (CIAF), but not stunting, as the measure of undernourishment.
Numerous previous researches showed that various measures of socioeconomic status,
such as income, educational level and family assets, were associated with nutritional
status in children [50, 52, 77]. The independent importance of both education and
85
86
Table 1. Frequency distribution and factors associated (binary logistic regression) with stunting among respondents by different socioeconomic
and demographic characteristics
Variables
Place of
residence
Social
category
Parental
education
Family size
House
ownership
Number of
living rooms
Cooking fuel
type
Drinking
water
Per capita
income
Per capita
expenditure
Categories
Total
(%)
Prevalence of stunting
Urban®
Rural
General®
Reserved
Both ≥ secondary*
Both < secondary
≤ 5 members*
> 5 members
Own*
291
285
389
187
117
459
418
158
458
50.5
49.5
67.5
32.5
20.3
79.7
72.6
27.4
79.5
N (%)
45 (15.5)
35 (12.3)
56 (14.4)
24 (12.8)
8 (6.8)
72 (15.7)
61 (15.6)
19 (12.0)
62 (13.5)
Rental
118
20.5
18 (15.2)
> 2 rooms*
≤ 2 rooms
Smokeless*
Smoky
Tube well*
Tap
Rs.>2000*
Rs. ≤2000
Rs.>1750*
Rs.≤1750
128
448
273
303
425
151
279
297
280
296
22.2
77.8
47.4
52.6
73.8
26.2
48.4
51.6
48.6
51.4
14 (10.9)
66 (14.7)
40 (14.6)
40 (13.2)
60 (14.1)
20 (13.2)
27 (9.7)
53 (17.8)
28 (10.0)
52 (17.6)
B
Wald
p
-0.27
1.21
0.27
-0.13
0.25
0.61
0.93
5.74
0.01
-0.22
0.63
0.42
0.14
0.23
0.63
0.34
1.19
0.27
-0.12
0.25
0.61
-0.07
0.07
0.79
0.71
7.8
0.01
0.65
6.73
0.01
OR
1
0.76
1
0.87
1
2.53
1
0.8
1
1.15
1
1.4
1
0.88
1
0.92
1
2.02
1
1.92
95 % CI for OR
Lower
Upper
0.47
1.23
0.52
1.46
1.18
5.42
0.46
1.38
0.65
2.03
0.76
2.59
0.55
1.42
0.54
1.6
1.23
3.33
1.17
3.13
® – reference category; CI – confidence interval, Binary logistic regression analysis (univariate model) considering effect of one predictor
variables
Table 2. Frequency distribution and factors associated (binary logistic regression) with stunting among respondents by child and maternal issues
Variables
Weight at birth
Elder sisters &
brothers
Younger sisters &
brothers
Birth order
Mother age at child
birth
Place of delivery
Mothers’ nutritional
status
Mothers’ height
Period of
breast feeding
Introduction of
supplementary food
Categories
2500 & above*
<2500
None*
Either or both
None*
Either or both
1st*
≥ 2nd
≥ 20 years*
<20 years
Institutional*
Home
Normal*
Undernourished
≥149.2cm*
<149.2cm
≥ 2 years*
< 2 years
≤ 6 months*
> 6 months
Total
518
58
337
239
373
203
342
234
362
214
346
230
520
56
288
288
306
270
456
120
(%)
89.9
10.1
58.5
41.5
64.8
35.2
59.4
40.6
62.8
37.2
60.1
39.9
90.3
9.7
50
50
53.1
46.9
79.2
20.8
Prevalence of
stunting
N (%)
64 (12.3)
16 (27.6)
46 (13.6)
34 (14.2)
44 (11.8)
36 (17.7)
46 (13.4)
34 (14.5)
43 (11.9)
37 (17.3)
36 (10.4)
44 (19.1)
74 (14.2)
6 (10.7)
32 (11.1)
48 (16.7)
44 (14.4)
36 (13.3)
65 (14.2)
15 (12.5)
B
Wald
p
0.93
9.49
0.01
0.05
0.04
0.84
0.48
3.83
0.05
0.09
0.13
0.71
0.44
3.26
0.07
0.71
8.56
0.01
0.32
0.52
0.47
0.47
3.67
0.05
0.09
0.13
0.72
0.15
0.24
0.62
OR
1
2.7
1
1.05
1
1.61
1
1.09
1
1.55
1
2.03
1
0.72
1
1.6
1
0.92
1
0.86
95.0% CI for OR
Lower
Upper
1.43
5.08
0.65
1.69
0.99
2.6
0.67
1.76
0.96
2.49
1.26
3.28
0.29
1.74
0.98
2.58
0.57
1.47
0.47
1.57
87
*Reference category; CI – confidence interval; Binary logistic regression analysis (univariate model) considering effect of one predictor
variable
Table 3. Results of a multivariate logistic regression model (enter method) to predict stunting
Variables
Parental education
Per capita income
Younger sisters
and brothers
Weight at birth
Place of delivery
Mother height
0.546
0.42
1.547
1.099
0.21
0.294
1.727
1.51
95.0% CI for OR
Lower
Upper
0.73
4.08
0.699
3.263
0.84
0.97
0.755
1.087
0.643
1.839
0.947
0.385
0.318
7.856
2.045
1.567
0.005
0.153
0.211
2.579
1.47
1.375
1.33
0.867
0.35
5.003
2.493
2.262
B
Wald
p
OR
CI – confidence interval
economic condition of the family for healthy growth of children were revealed in
numerous previous studies, especially from low and middle-income countries [13, 32,
54, 57, 78]. There are plenty of evidence showing a positive association between low
income and prevalence of stunting [31, 33, 37, 51, 57]. Therefore, improvement of the
economic condition along with education seemed to be an effective measure to reduce
child undernutrition, including stunting.
Similar to income and parental education, lower birth weight and birth at home,
rather than in institutional health facilities, also showed association with higher chances
of being stunted among the 3-12 years old boys in the present study. It is, however,
worth mentioning that having one or more younger siblings and low mother’s height
was also very close to be significantly associated with stunting (Wald: 3.83 and 3.67,
respectively, both p=0.05). Researchers have reported that the risk of stunting was
higher among children born underweight. In this study, the direction of a relationship
between birth weight and childhood undernutrition was in line with the results of other
studies that showed that low birth weight had a significant higher risk of stunting in
childhood [53, 60]. As mentioned above, the present study also revealed a close linkage
between stunting and having younger brothers and sisters. This could, however, be the
result of relatively increased attention towards the younger children by the parents in a
resource-constrained setting, particularly in terms of food distribution and health care.
Indeed, previous studies in similar populations in the same Indian state showed that a
higher risk of stunting was associated with the presence of younger sisters and brothers
[7, 51]. Place of delivery was a significant predictor of stunting in the present study, as
also was reported in another study in Malawi [12]. In the present study, the relatively
short mothers (<149.2 cm) had more stunted boys, although this association was not
statistically significant, although closely to be. Studies identified mother’s height to
be closely linked with birth weight and length of offspring [84]. Evidence showed
that maternal malnutrition was a risk for survival, health, and development among the
offspring and may create an intergenerational cycle of malnutrition in the future where
a stunted female child would become a stunted mother and would, in turn, deliver
another stunted child [19].
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However, all the above associations disappeared in the multiple regression
analyses, whereas only the birth weight showed a significant independent association
with the prevalence of stunting, allowing for all other potential factors. Boys with
lower birth weight showed higher chances of being stunted at 3-12 years. Even family
income or parental education did not qualify for a significant statistical effect on the
stunting prevalence, as shown in our previous studies with the same data set, in rural
and urban counterparts, respectively [35, 36]. In a study in Indonesia, LBW was the
major predictor of stunting among infants aged 12-23 months. LBW infants showed
1.74 times higher likelihood to be stunted (95% CI 1.38-2.19) compared to those
born with normal weight [4]. In the pre-school children in Bangladesh, birth size was
one of the important determinants of stunting [59]. Another study from Zimbabwe
showed decreased growth in LBW babies than normal-weight babies, and significant
length differences appeared at 12 months of age [47]. The major factors responsible
for undernutrition in under-five children in Pakistan were size at birth, previous birth
interval, mothers’ BMI at birth and parental education [61]. In the present study,
mothers’ nutritional status (BMI) was not associated with stunting.
LBW and stunting together were held responsible for more than two million deaths
and ninety million disability-adjusted life years or DALYs [41]. India alone suffered 0.6
million deaths and 24.6 million DALYs from countries across the world due to stunting
and IUGR/LBW [41]. LBW can result from preterm delivery or intrauterine growth
restriction (IUGR) or a combination of the two. The global prevalence of LBW is 15.5%,
which means that about 20.6 million infants with LBW are born each year, 96.5% of
them in developing countries [79]. Globally, 14.6 percent of babies were born with low
birth weight out of 20.5 million new born in 2015 [75]. India alone, with an estimated
33% of all newborns weighing < 2500g at birth, contributed 40% of the world’s LBW
population [30]. The prevalence of low birth weight in India was 21.4% in 2017 [29].
As per NFHS-3, the prevalence of LBW in West Bengal was 22% [28]. The causes of
LBW are numerous and multifaceted. It depends on complex interactions of numerous
factors like genetic, reproductive, socio-demographic, cultural, political and surrounding
physical environmental conditions [3] and regional factors [46, 56, 71]. The etiology
of LBW is maximally related to maternal [14, 15, 21, 26, 63], and socioeconomic and
psychological factors [2, 69, 49]. Stunting is generally regarded as an expression of
chronic deprivation from nutritional requirements at the population level. To determine
the state of stunting, the importance of birth weight is independent of other important
determinants. This indicates that improvement of maternal health and obstetric care, and
socioeconomic development might improve the nutritional health of children. It might
also have a long-term impression extended to adulthood. The observed correlations and
linear associations between birth size and adult height have been consistent in several
studies, although from the high-income countries [38, 40, 76].
Undoubtedly, undernourishment occurs from food deprivation or due to a diet
deficiency in essential nutrients. Growing children starkly exhibit its consequences.
Stunting is widely regarded as one of the efficient proxy measures of chronic
undernutrition in children. However, there is adequate debate in recent times over
the unquestionable acceptance of short stature, particularly in children, as a perfect
proxy to undernourishment [67]. There are also evidence indicating that nutritional
interventions did not always improve relative body size in children in terms of stature
[22], or if at all, with a small effect size [48]. Even stunting or small stature in children
89
often poorly correlate with other anthropometric measures of nutritional/energy stores
in the body [24, 67, 68]. Keeping in view these lines of arguments and recent evidence,
including the present one, it appears that stunting (short stature) is not essentially a
product of undernutrition. Maternal and prenatal health and nutritional conditions also
influence body height in childhood through the size at birth.
The WHO has set a goal of reducing LBW and stunted children aged 5 years
by 40% between 2010 to 2025 [83]. However, to fulfil this sacred ambition, further
extensive studies, preferably with longitudinal designs in varied ecological contrasts,
might assess the appropriateness of stature as a measure of undernourishment in
children, especially in India. It was earlier proposed that the small size could adapt to
unique mother-child ecology in a chronically resource-constrained situation rather than
a clinical condition [11].
The study has some inherent limitations. As this study included only boys, the
impact of birth weight in girls, allowing for socioeconomic factors that might have
different impacts on two genders, is worth investigating in further studies. The current
investigation also lacked detailed information on food intake and the composition of
the diet and no information on the physical exercise pattern. However, if supported
by some further evidence from similar populations, the results of this study could
have direct policy implications in terms of interventions to reduce the burden of
undernutrition in Indian children.
Conclusion
In this study, stunting in school going boys aged 3-12 years in Purba Medinipur district
of West Bengal was significantly associated with LBW. Among the potential factors,
LBW was the most dominant concomitant of stunting. Programmes for the reduction
of stunting should focus on the socioeconomic improvement, particularly, on spreading
education, and on the health of women, particularly before and during pregnancy.
Acknowledgement: All participants and their parents are sincerely acknowledged for
allowing for data collection. Block Development Officer and Child Development Programme
Officer of Desopran Block are also gratefully acknowledged for giving their permissions.
Authors’ contributions: PK collected and analyzed the data and prepared the draft
manuscript. KB designed and supervised the study, analyzed the data and provided intellectual
inputs to the manuscript. RC designed the study and prepared the final manuscript.
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