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Maternal, infant and child nutrition

Nutrition and Dietetics (B.Sc) · Human nutrition · free study notes for exams, placements and interviews

In short

Maternal, infant and child nutrition covers the nutritional needs, assessment and interventions across the "first 1,000 days" — from conception through pregnancy, lactation, infancy and the second year — plus the pre-school and school years. It matters because undernutrition in this window causes irreversible losses in growth, immunity and cognition, and because maternal nutritional status directly sets birth weight and early survival. It is examined in every B.Sc Nutrition and Dietetics paper on human nutrition (RDA computation, growth monitoring, IYCF, national programmes) and in M.Sc/NET and dietitian-registration (IDA RD) entrance tests. Employers test it in interviews for ICDS/NHM nutrition posts, hospital dietetics (antenatal and paediatric wards), FSSAI-regulated infant-food companies, and nutrition roles in NGOs and development agencies.

Explained

The first 1,000 days and the life-cycle approach

Maternal nutrition in pregnancy

Lactation

Infant feeding: breast milk, formula and complementary feeding

Growth monitoring and nutritional assessment

Indian programmes, standards and current status

Key points

Formulas and examples

Body mass index BMI = weight (kg) / height (m)²; pre-pregnancy BMI decides the recommended weight-gain range. Asian-Indian cut-offs: underweight < 18.5, normal 18.5–22.9, overweight 23–24.9, obese ≥ 25 kg/m².
Pregnancy energy requirement = non-pregnant requirement (kcal/day) + 350 kcal/day (trimesters 2 and 3).
Lactation energy requirement = non-pregnant requirement + 600 kcal/day (0–6 months) or + 520 kcal/day (6–12 months).
Z-score (SD score) Z = (observed value − median of reference) / SD of reference; applied to weight-for-age, height-for-age and weight-for-height.
Percent of expected weight (IAP grading) = (actual weight / median weight-for-age) × 100.
Energy from breast milk = volume (ml) × 0.67 kcal/ml (mature human milk ≈ 67 kcal/100 ml).
Complementary food energy needed = total energy requirement for age − energy supplied by breast milk.
Energy density = energy of food (kcal) / weight of food (g); target ≈ 0.8–1.0 kcal/g for infant foods.
Elemental iron in a salt = tablet weight of salt (mg) × iron fraction; e.g. ferrous sulphate heptahydrate is ~20% elemental iron, so a 300 mg tablet gives ~60 mg iron.

Example 1 — Energy and protein for a pregnant woman. A 26-year-old sedentary woman, 52 kg, 1.58 m, in her third trimester. Non-pregnant sedentary requirement taken as 1,660 kcal/day and protein RDA 0.83 g/kg → 43 g/day (rounded from 52 × 0.83 = 43.2 g).

Example 2 — Lactation and milk output. A mother exclusively breastfeeding a 3-month-old secretes 800 ml/day.

Example 3 — Complementary feeding gap at 9 months. A 9-month-old weighs 8 kg; take the energy requirement as 80 kcal/kg/day and breast-milk intake as 600 ml/day.

Example 4 — Classifying a child. A 24-month-old girl: weight 8.4 kg, height 79 cm. WHO medians: weight-for-age 11.5 kg, height-for-age 85.7 cm; weight-for-height median at 79 cm ≈ 10.4 kg. MUAC 12.1 cm, no oedema.

Example 5 — ICDS ration check. An Anganwadi take-home ration gives 100 g fortified wheat–soya mix (360 kcal, 14 g protein), 20 g oil (180 kcal) and 20 g jaggery (76 kcal) to a 2-year-old.

FeatureHuman milkCow's milkInfant formula
Protein (g/100 ml)~1.1~3.2~1.4–1.8 (adjusted)
Whey : casein60:4020:80~60:40 (whey-adapted)
Lactose (g/100 ml)~7.0~4.7~7 (added)
Energy (kcal/100 ml)~67~67~67
Iron bioavailabilityHigh (~50%)LowFortified, moderate
Anti-infective factorsIgA, lactoferrin, lysozyme, oligosaccharidesAbsent for human infantAbsent
Renal solute loadLowHighModerate
Cost and safetyFree, sterileUnsuitable < 12 monthsCostly, contamination risk
IndexWhat it measuresCut-off (WHO)Interpretation
Weight-for-ageComposite< −2 SD / < −3 SDUnderweight / severely underweight
Height-for-ageChronic< −2 SD / < −3 SDStunted / severely stunted
Weight-for-heightAcute< −2 SD / < −3 SDWasted / severely wasted
MUAC (6–59 m)Acute, mortality risk11.5–12.5 cm / < 11.5 cmMAM / SAM
BMI-for-age (5–19 y)Thinness/overweight< −2 SD / > +1 SD / > +2 SDThin / overweight / obese

Where it is used

Interview questions

Common mistakes

Related topics

Energy and macronutrient requirements: ICMR-NIN RDA and EAR · Vitamins and minerals: functions, sources and deficiencies · Meal planning for the life cycle · Food groups and the Indian food composition tables (IFCT) · Nutrition basics · Functional foods, nutraceuticals and dietary supplements

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