Weight is the number that parents track most closely — and worry about most. The paediatrician weighs the baby at every visit. The nanny gets asked every day. Grandparents comment on whether the baby looks "chubby enough." It can feel like the number is everything.
It isn't. A single weight reading tells you almost nothing. What matters is the trend — is your baby following their growth curve? Are they gaining steadily? Are they alert, feeding well, and producing the right number of wet nappies? Those questions are more useful than any single number on a scale.
That said, knowing the typical ranges helps you have better conversations with your paediatrician and catch things worth raising early.
Average baby weight by month — India
The figures below are based on WHO Child Growth Standards, which include data from Indian children and are used by paediatricians across India. These are median weights — half of healthy babies weigh more, half weigh less. The range in parentheses represents the typical healthy spread (roughly 10th to 90th percentile).
| Age | Girls (median / range) | Boys (median / range) |
|---|---|---|
| Birth | 3.2 kg (2.5–4.0 kg) | 3.3 kg (2.6–4.2 kg) |
| 1 month | 4.2 kg (3.4–5.1 kg) | 4.5 kg (3.6–5.5 kg) |
| 2 months | 5.1 kg (4.2–6.2 kg) | 5.6 kg (4.5–6.8 kg) |
| 3 months | 5.8 kg (4.9–7.0 kg) | 6.4 kg (5.1–7.7 kg) |
| 4 months | 6.4 kg (5.4–7.7 kg) | 7.0 kg (5.7–8.5 kg) |
| 6 months | 7.3 kg (6.1–8.7 kg) | 7.9 kg (6.5–9.5 kg) |
| 9 months | 8.2 kg (6.9–9.9 kg) | 8.9 kg (7.2–10.9 kg) |
| 12 months | 8.9 kg (7.5–10.7 kg) | 9.6 kg (7.7–11.8 kg) |
A note on Indian birth weights: Indian newborns are typically lighter than global medians — average birth weight in India is closer to 2.8–3.0 kg versus 3.3 kg globally. This is partly genetic, partly related to maternal nutrition. Most Indian paediatricians account for this when reading growth curves. If your baby was born at 2.6 kg and is tracking steadily along their own growth curve, that's healthy — even if they appear to be in a lower percentile.
How much weight should a baby gain per week?
| Age | Expected weekly gain | Expected monthly gain |
|---|---|---|
| 0–3 months | 150–250 g/week | 600–1,000 g/month |
| 3–6 months | 100–150 g/week | 400–600 g/month |
| 6–12 months | 70–90 g/week | 280–360 g/month |
Weight gain in the first 3 months is the fastest it will ever be, relative to body size. After 6 months, gain slows noticeably — this is normal. Many parents worry that their baby has "stopped growing" when in reality the baby is just growing at the expected slower pace for their age.
The first week: weight loss is normal
Most newborns lose 5–10% of their birth weight in the first 3–4 days. This is entirely normal — they're losing extra fluid, and breastmilk supply takes a few days to establish. Most babies regain their birth weight by day 10–14.
If your baby loses more than 10% of their birth weight, or hasn't regained it by 2 weeks, your paediatrician will want to assess feeding and look at possible causes. This is one reason early paediatric visits (at 3 days and 2 weeks) matter.
What affects how much a baby weighs
- Feeding method: Breastfed babies and formula-fed babies grow at slightly different rates in the first few months. Breastfed babies often gain faster in the first 2–3 months, then slower from 3–12 months compared to formula-fed babies. Both patterns are healthy.
- Birth weight: Smaller babies tend to catch up — "catch-up growth" is a recognised phenomenon where babies born small grow faster than expected for a period.
- Prematurity: Premature babies are plotted on adjusted age growth charts, not regular charts, for the first 2 years. Make sure your paediatrician is using corrected age.
- Illness: Even a minor illness can temporarily slow weight gain. A brief plateau after a fever is common and recovers on its own.
- Activity: Babies who move more (very active, crawling early) may gain weight more slowly. This is usually not a concern if they're eating well and developing normally.
- Genetics: Tall, lean parents tend to have babies who track in lower weight percentiles. This is often wrongly flagged as a problem when it's simply family pattern.
Cherish
Track feeds, growth, and every moment — together
Log your baby's feeds and track patterns over time. Your nanny can log by voice in Hindi or English. You see everything from work, in real time.
See how it worksSigns of healthy weight gain (beyond the scale)
Weight is one signal. These are equally important:
- Wet nappies: 6+ wet nappies per day after day 5 is a strong sign of adequate feeding — especially for breastfed babies where you can't see how much milk is consumed
- Alertness: A baby who is feeding well is alert between feeds — not lethargic, limp, or excessively sleepy
- Feeding cues: The baby shows hunger cues and feeds with vigour, not just weakly sucking
- Stool output: In the first weeks, frequent stools (especially in breastfed babies) signal good milk transfer. After 6 weeks, stool frequency drops and this is still normal
- Visible fullness: After a feed, the baby appears satisfied — less fussy, relaxed limbs, may fall asleep
When to be concerned about weight
These are signs worth raising with your paediatrician promptly — not to panic, but to assess:
- Baby loses more than 10% of birth weight in the first week
- Baby hasn't regained birth weight by 2 weeks
- Baby is consistently gaining less than 150 g per week in the first 3 months
- Weight curve drops across 2 percentile lines on the growth chart
- Baby seems excessively sleepy and hard to wake for feeds
- Less than 6 wet nappies per day after day 5
- You notice the baby seems to be in pain during or after feeds (possible reflux)
A word on weight gain and breastfeeding in India
Breastfeeding challenges are one of the most common reasons for slow weight gain in the first few months, and they're also one of the most fixable. Latch problems, low supply, ineffective transfer — all of these are addressable with the right support. In many Indian cities, lactation consultants are now available, and some work via video call. If your baby isn't gaining well and you're breastfeeding, getting a feed assessment from a lactation specialist can be more useful than switching to formula immediately.
Frequently asked questions
What is the normal weight of a baby in India?
The average birth weight of an Indian newborn is between 2.5 kg and 3.5 kg. By 12 months, most babies weigh roughly 3 times their birth weight — typically 8.5 to 10.5 kg for girls and 9 to 11 kg for boys.
How much weight should a baby gain per month?
In the first 3 months: 600–1,000 grams per month. From 3 to 6 months: 400–600 grams per month. From 6 to 12 months: 280–360 grams per month. These are averages — your paediatrician tracks the trend over time, which matters more than any single number.
Is my baby underweight?
Whether a baby is underweight is determined by plotting weight on a growth chart and tracking the trend — not by comparing to one number. A baby consistently at the 10th percentile who is tracking steadily is different from one who has dropped from the 50th to the 5th. Your paediatrician can assess the full picture.
Why is my baby not gaining weight?
Common causes include insufficient milk intake, formula preparation errors, frequent illness, reflux, or feeding pain. Tracking feeds carefully — how often, how long, how much — can help your paediatrician spot patterns quickly. An app like Cherish makes this easy to track and share.