The Role of Maternal Diet and Iron-Folic Acid Supplements in Influencing Birth Weight: Evidence from India's National Family Health Survey

Nisha Malhotra; Ravi Prakash Upadhyay; Meenakshi Bhilwar; Nicholas Choy; Timothy Green

doi:10.1093/tropej/fmu051

Maternal Nutrition and Birth Outcomes · Evidence from India

Maternal Diet, Iron–Folic Acid Supplements & Birth Weight

Evidence from India’s National Family Health Survey on maternal diet, supplementation duration and low birth weight

Nisha Malhotra, Ravi Prakash Upadhyay, Meenakshi Bhilwar, Nicholas Choy and Timothy Green

Journal of Tropical Pediatrics · Volume 60, Issue 6 · Pages 454–460 · Published 27 September 2014 · DOI 10.1093/tropej/fmu051

National survey dataMaternal nutritionLow birth weightIndia

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What did this study examine?

Low birth weight is associated with greater risks of infant illness, mortality and impaired growth. Maternal nutrition during pregnancy is one pathway through which birth outcomes may be improved, but national evidence linking dietary practices and supplement use to birth weight has often been limited.

This study used data from India’s 2005–06 National Family Health Survey to examine whether maternal diet and the duration of iron–folic acid supplementation were associated with infant birth weight after accounting for maternal, household and socioeconomic characteristics.

The findings suggest that dietary quality and sustained supplementation both matter. Daily consumption of milk or curd, fruit, pulses and beans was associated with higher odds of avoiding low birth weight, while each additional month of iron–folic acid supplementation was associated with an estimated 6.46-gram increase in birth weight.

Key adjusted findings

6.46 g

Iron–folic acid duration

Estimated increase in infant birth weight for each additional month of supplementation during pregnancy.

1.20

Daily fruit consumption

Adjusted odds ratio for not having a low-birth-weight infant among mothers consuming fruit daily.

1.18

Daily pulses and beans

Adjusted odds ratio for avoiding low birth weight among mothers consuming pulses and beans daily.

1.17

Daily milk or curd

Adjusted odds ratio for not having a low-birth-weight infant among mothers consuming dairy daily.

Main interpretation: The study does not show that any single food or supplement duration caused a specific birth outcome. It provides adjusted population-level evidence that maternal dietary quality and longer iron–folic acid use were associated with healthier birth-weight outcomes.

What is the study’s main contribution?

Linking programme inputs to maternal behaviour and birth outcomes

Maternal nutrition programmes are often monitored through supplement distribution or antenatal-care contact. This study highlights the need to examine what happens after distribution: duration of use, adherence, dietary quality and the relationship between those inputs and infant outcomes.

It also shows why nutrition policy cannot be reduced to one intervention. Supplementation and access to micronutrient-rich foods operate through related but distinct pathways.

Maternal nutrition pathway

Dietary access

Availability and affordability of diverse, nutrient-rich foods.

Nutrition behaviour

Actual consumption of dairy, fruit, pulses, beans and other foods.

Supplement use

Duration and adherence to iron–folic acid supplementation.

Maternal nutrition

Improved micronutrient availability during pregnancy.

Birth outcome

Higher birth weight and lower probability of low birth weight.

What patterns emerged?

Iron–folic acid

Each additional month of iron–folic acid supplementation during pregnancy was associated with an estimated 6.46-gram increase in infant birth weight.

Milk and curd

Daily consumption was associated with 17% higher adjusted odds of not having a low-birth-weight infant.

Fruit

Daily fruit consumption was associated with 20% higher adjusted odds of avoiding low birth weight; weekly consumption was associated with 13% higher odds.

Pulses and beans

Daily consumption was associated with 18% higher adjusted odds of not having a low-birth-weight infant.

Fish

Weekly fish consumption was negatively associated with the odds of avoiding low birth weight in the adjusted model. This observational result requires cautious interpretation and should not be treated as a general dietary recommendation.

Study design

Data source

India’s National Family Health Survey, 2005–06.

Study focus

Maternal diet, iron–folic acid supplementation and infant birth weight.

Outcomes

Infant birth weight and the probability of low birth weight.

Analysis

Multivariable regression accounting for maternal, household and socioeconomic characteristics.

Implications for policy and programmes

Measure use, not only distribution

Programme monitoring should distinguish supplements supplied from supplements consumed and track duration of use across pregnancy.

Combine supplementation with counselling

Antenatal services should pair iron–folic acid provision with practical dietary guidance that reflects local food availability and household constraints.

Track dietary quality

Nutrition programmes should include measures of dietary diversity and consumption rather than treating supplementation as a complete substitute for food-based strategies.

Evaluate maternal and infant outcomes together

Strong programme evaluation should connect supply, adherence, maternal diet, anaemia-related indicators and infant birth outcomes.

Publication and policy resources

Publisher record

View the article, abstract and bibliographic information through Oxford Academic.

Open the DOI record

PubMed record

Access the indexed abstract and citation through the U.S. National Library of Medicine.

Open PubMed

Two-page policy brief

A concise summary of the findings, methods and implications for maternal-nutrition programmes.

Download the policy brief

Maternal and Child Nutrition Hub

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ORCID record

View Nisha Malhotra’s research record and publication identifiers.

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Questions this research answers

How do maternal diet and iron–folic acid supplementation relate to birth weight?

National survey evidence suggests that both are associated with birth outcomes. Daily consumption of dairy, fruit, pulses and beans was associated with higher odds of avoiding low birth weight, and each additional month of iron–folic acid supplementation was associated with an estimated 6.46-gram increase in birth weight. The study reports adjusted associations, not proof of causation. Birth weight is influenced by many maternal, clinical, environmental and socioeconomic factors. The findings support sustained use and careful programme evaluation, but they do not imply a guaranteed individual outcome.

Why is duration and not just distribution of supplementation important?

Distribution data show whether supplements were supplied. Duration provides a better indication of exposure over pregnancy. The study’s estimate suggests that longer use upto the recommended time was associated with progressively higher birth weight.

What should maternal-nutrition programmes measure?

Programmes should track supplement distribution, duration, adherence, dietary quality, counselling exposure, maternal nutrition indicators and infant outcomes rather than relying on a single implementation measure.