Baby weight chart from birth to 5 years: the WHO median and healthy range for girls and boys in kg or lb, so you can see where your own baby’s weight sits.
There is no one right size for a healthy baby. The WHO Child Growth Standards were built from healthy breastfed children, and anything from roughly the 3rd to the 97th percentile counts as the usual range. More important than any single weigh-in is that your baby keeps following a steady curve.
Age
Boys: median (usual range)
Girls: median (usual range)
Birth
3.3 kg (2.5–4.4)
3.2 kg (2.4–4.2)
3 months
6.4 kg (5.1–7.9)
5.8 kg (4.6–7.4)
6 months
7.9 kg (6.4–9.7)
7.3 kg (5.8–9.2)
9 months
8.9 kg (7.2–10.9)
8.2 kg (6.6–10.4)
12 months
9.6 kg (7.8–11.8)
8.9 kg (7.1–11.3)
2 years
12.2 kg (9.8–15.1)
11.5 kg (9.2–14.6)
3 years
14.3 kg (11.4–18.0)
13.9 kg (11.0–17.8)
5 years
18.3 kg (14.3–23.8)
18.2 kg (14.0–24.4)
Numbers are WHO medians, rounded; brackets show the 3rd to 97th percentile range. It is normal for newborns to drop up to 7–10% of their birth weight over the first few days and win it back by around 2 weeks; by 4–5 months most weigh twice what they did at birth, and around three times as much by their first birthday. For a full percentile including length and head size, open the baby growth percentile tool.
Common questions
How much does a typical 6-month-old weigh?
On WHO standards, boys average about 7.9 kg (usual range 6.4–9.7 kg) and girls about 7.3 kg (5.8–9.2 kg).
When is a baby’s weight a concern?
If it sits under the 3rd percentile, or drops across two percentile lines, ask your paediatrician to take a look.
Is weight gain different for breastfed babies?
Often they put on weight more quickly early on and more slowly afterwards. Because the WHO standards were built from breastfed babies, they match this pattern.
My newborn lost weight after birth — is that normal?
Yes, losing up to 7–10% in the first days is common, and most babies regain it by about 2 weeks. Tell your doctor if the loss is larger or slow to recover.
Checked against the sources listed. This is general guidance only and not a substitute for medical advice — please speak to your doctor about your own situation.