Your baby at 13 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 13 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 | 9.88 kg | 9.17–10.63 kg | 9.17 kg | 8.45–9.97 kg |
| Length | 76.9 cm | 75.3–78.6 cm | 75.2 cm | 73.5–77.0 cm |
| Head circumference | 46.3 cm | 45.5–47.2 cm | 45.2 cm | 44.3–46.1 cm |
Want the number for your own baby? Open the percentile calculator
Sleep at 13 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.
- Stands aloneGross motorusual window: 9–15
- 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
- First wordSpeechusual window: 9–15
- Waves bye-byeSocialusual window: 8–14
- Points to picturesCognitiveusual window: 12–20
Reference figures, not medical advice. Every baby differs; a check-up answers questions a table cannot.