Your baby at 17 months
Everything that lines up at this one age — growth figures from the WHO standard, sleep norms, the milestones whose normal window covers this month, and the vaccine doses due. Percentiles are called centiles in the UK; the numbers are identical.
Growth at 17 months
Median means half of babies are above and half below. Being away from the median is not a problem in itself — following your own curve is what matters.
| Median (50th) · Boys | Middle half (25th–75th) · Boys | Median (50th) · Girls | Middle half (25th–75th) · Girls | |
|---|---|---|---|---|
| Weight | 10.73 kg | 9.96–11.56 kg | 10.02 kg | 9.23–10.90 kg |
| Length | 81.2 cm | 79.5–83.0 cm | 79.7 cm | 77.7–81.6 cm |
| Head circumference | 47.2 cm | 46.3–48.1 cm | 46.1 cm | 45.1–47.0 cm |
Want the number for your own baby? Open the percentile calculator
Sleep at 17 months
Ranges, not targets. Healthy babies sit outside them regularly.
- Total per day
- 11 h – 14 h
- One nap
- 1 h – 1 h 30 m
- Night sleep
- 10 h – 12 h
Milestones in this window
The window is when a skill usually appears — not a deadline. Appearing later than the window is a reason to mention it at a check-up, not to worry alone.
- First stepsGross motorusual window: 8.2–17.6
- Walks wellGross motorusual window: 12–20
- Stacks 2 blocksFine motorusual window: 12–18
- ScribblesFine motorusual window: 12–24
- Two-word phrasesSpeechusual window: 16–24
- Plays pretendSocialusual window: 14–24
- Points to picturesCognitiveusual window: 12–20
Reference figures, not medical advice. Every baby differs; a check-up answers questions a table cannot.