Laughter, chuckles and reaching for toys make month four a lot of fun.
These are things most children (about 3 in 4) can do by this age. Babies born early may reach them later — use their corrected age.
| Weight (3rd–97th) | Length (3rd–97th) | Head (median) | |
|---|---|---|---|
| Boys | 5.6–8.6 kg (median 7) | 60–67.8 cm (median 63.9) | 41.6 cm |
| Girls | 5.1–8.1 kg (median 6.4) | 58–66.2 cm (median 62.1) | 40.6 cm |
Any steady curve within this range is normal; what matters is that your baby follows their own curve over time.
No routine vaccine is scheduled this month on the IAP or UIP schedules. Check that earlier doses are complete.
Most 4-month-olds: chuckles and smiles to get your attention; holds the head steady without support; holds a toy when you put it in the hand; may start rolling from tummy to back.
The WHO median is 7 kg for boys and 6.4 kg for girls; the normal range is wide (see the table).
12–16 h in 24 hours including 3 naps.