Month-by-month overview
| Age | A typical milestone | Boy (median) | Girl (median) | Sleep / 24 h |
|---|---|---|---|---|
| 1 month | Focuses on faces 20–30 cm away and prefers your face to anything else | 4.5 kg | 4.2 kg | 14–17 h |
| 2 months | Smiles at people | 5.6 kg | 5.1 kg | 14–17 h |
| 3 months | Coos and makes gurgling sounds | 6.4 kg | 5.8 kg | 12–16 h |
| 4 months | Chuckles and smiles to get your attention | 7 kg | 6.4 kg | 12–16 h |
| 5 months | Reaches for and grabs toys with both hands | 7.5 kg | 6.9 kg | 12–16 h |
| 6 months | Laughs, knows familiar people | 7.9 kg | 7.3 kg | 12–16 h |
| 7 months | Sits with little or no support | 8.3 kg | 7.6 kg | 12–16 h |
| 8 months | Sits steadily without support | 8.6 kg | 7.9 kg | 12–16 h |
| 9 months | Sits without support and gets into sitting on their own | 8.9 kg | 8.2 kg | 12–16 h |
| 10 months | Pulls up to stand and may cruise holding furniture | 9.2 kg | 8.5 kg | 12–16 h |
| 11 months | Stands briefly without holding on | 9.4 kg | 8.7 kg | 12–16 h |
| 12 months | Pulls up to stand and walks holding furniture | 9.6 kg | 8.9 kg | 11–14 h |
| 13 months | Walks a few steps alone or with one hand held | 9.9 kg | 9.2 kg | 11–14 h |
| 14 months | Walks alone, sometimes falling | 10.1 kg | 9.4 kg | 11–14 h |
| 15 months | Takes a few steps on their own | 10.3 kg | 9.6 kg | 11–14 h |
| 16 months | Walks well and may start to run stiffly | 10.5 kg | 9.8 kg | 11–14 h |
| 17 months | Climbs onto furniture | 10.7 kg | 10 kg | 11–14 h |
| 18 months | Walks without holding on | 10.9 kg | 10.2 kg | 11–14 h |
| 19 months | Says 10–20 words | 11.1 kg | 10.4 kg | 11–14 h |
| 20 months | Starts joining two words ("more milk") | 11.3 kg | 10.6 kg | 11–14 h |
| 21 months | Runs more steadily | 11.5 kg | 10.9 kg | 11–14 h |
| 22 months | Says two-word phrases | 11.8 kg | 11.1 kg | 11–14 h |
| 23 months | Uses 50 or more words | 12 kg | 11.3 kg | 11–14 h |
| 24 months | Kicks a ball | 12.2 kg | 11.5 kg | 11–14 h |
Weights are WHO Child Growth Standards medians, used in India and most countries. Milestones follow the CDC list of what most children (75%) do by each age.