Your baby at 12 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 12 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	9.65 kg	8.96–10.38 kg	8.95 kg	8.24–9.72 kg
Length	75.7 cm	74.1–77.3 cm	74.0 cm	72.3–75.7 cm
Head circumference	46.1 cm	45.2–46.9 cm	44.9 cm	44.0–45.8 cm

Want the number for your own baby? Open the percentile calculator

Sleep at 12 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
Pincer graspFine motorusual window: 7–12
Stacks 2 blocksFine motorusual window: 12–18
ScribblesFine motorusual window: 12–24
First wordSpeechusual window: 9–15
Waves bye-byeSocialusual window: 8–14
Object permanenceCognitiveusual window: 7–12
Points to picturesCognitiveusual window: 12–20

Vaccine doses at this age

Routine doses only, from the national schedules as published by each country's health authority. Vaccinations always follow chronological age, even for premature babies.

United States

Hepatitis Adose 1
Hibdose 4
MMRdose 1
Pneumococcal (conjugate)dose 4
Varicelladose 1

United Kingdom

Meningococcal Bdose 3
MMRVdose 1
Pneumococcal (conjugate)dose 2

Reference figures, not medical advice. Every baby differs; a check-up answers questions a table cannot.