Birth Weight

Birth weight is an important early indicator of a baby's health. Babies weighing under 2.5 kg are considered low birth weight (LBW); under 1.5 kg, very low; under 1 kg, extremely low. LBW can result from being born preterm, growing poorly in the womb, or both. India has one of the highest rates of low birth weight in the world.

Why it matters

• Higher newborn complications — temperature instability, breathing, feeding, infection, jaundice, bleeding.
• Higher risk of developmental problems — more marked in very/extremely low birth weight.
• Long-term risk — evidence links low birth weight with adult hypertension, diabetes, heart disease, chronic kidney disease.
• Getting early nutrition, warmth, and KMC right makes a large difference to short- and long-term outcomes.

Common causes

• Preterm birth (before 37 weeks).
• Poor maternal nutrition, anaemia, low pre-pregnancy weight.
• Pre-eclampsia, gestational diabetes, severe infections in pregnancy.
• Placental problems.
• Multiple pregnancy (twins, triplets).
• Smoking, tobacco chewing, alcohol, drug use.
• Very young or older mothers.
• Short intervals between pregnancies.
• Genetic conditions, congenital infections.
• Exposure to indoor/outdoor air pollution.

Care for a low-birth-weight baby

• Warmth — skin-to-skin with mother (Kangaroo Mother Care) is the single most valuable intervention.
• Exclusive breast milk — directly or expressed; donor milk if mother's is delayed.
• Infection prevention — hand hygiene, minimise visitors, vaccinate on schedule.
• Regular weight and feeding monitoring — usually at the hospital, then paediatrician/anganwadi.
• Micronutrient supplements as advised.
• Follow-up for ROP (eye screening), hearing, development, growth — for months/years.
• Early intervention services (DEIC) if delays appear.

Prevention — during pregnancy

• Good antenatal care — regular visits, BP, haemoglobin, nutrition, vaccines.
• Correct anaemia aggressively (iron-folic acid daily).
• Stop all tobacco, alcohol, unregulated drugs.
• Reduce indoor smoke, air-pollution exposure where possible.
• Adequate food intake — an extra 300-450 kcal/day in second and third trimesters.
• Treat gestational diabetes and hypertension.
• Spacing pregnancies at least 2 years apart.