Children's Clothing Size Guide

Baby and children's clothing size charts — UK, EU, and US sizes by age, height, and measurements.

Baby Sizes (0–24 months)

Sizes are based on height and weight. All babies develop at different rates — always measure your child.

UK Size	EU	US	Age	Height	Weight
Newborn	50	NB	0–1 month	Up to 56 cm	Up to 4 kg
0–3m	56	0–3m	0–3 months	56–62 cm	4–6 kg
3–6m	62	3–6m	3–6 months	62–68 cm	6–8 kg
6–9m	68	6–9m	6–9 months	68–74 cm	8–9.5 kg
9–12m	74	9–12m	9–12 months	74–80 cm	9.5–11 kg
12–18m	80	12–18m	12–18 months	80–86 cm	11–12.5 kg
18–24m	86	18–24m	18–24 months	86–92 cm	12.5–14 kg

Children's Sizes (2–14 years)

Chest and waist measurements in centimetres. Height in centimetres.

UK Size	EU	US	Age	Height (cm)	Chest (cm)	Waist (cm)
2–3Y	92–98	2T–3T	2–3 years	92–98 cm	53	52
3–4Y	98–104	3T–4T	3–4 years	98–104 cm	55	53
4–5Y	104–110	4T–5T	4–5 years	104–110 cm	57	54
5–6Y	110–116	5–6	5–6 years	110–116 cm	60	55
6–7Y	116–122	6–7	6–7 years	116–122 cm	63	56
7–8Y	122–128	7–8	7–8 years	122–128 cm	66	57
8–9Y	128–134	8–9	8–9 years	128–134 cm	69	59
9–10Y	134–140	9–10	9–10 years	134–140 cm	72	61
10–11Y	140–146	10–11	10–11 years	140–146 cm	75	63
11–12Y	146–152	11–12	11–12 years	146–152 cm	78	65
12–13Y	152–158	12–13	12–13 years	152–158 cm	82	67
13–14Y	158–164	13–14	13–14 years	158–164 cm	86	69

Sizing Tip

Children grow quickly, so many parents buy one size up to allow for growth. However, for school uniforms and formal wear, it is better to buy the correct current size for a smarter fit. Always measure your child's height and chest rather than relying on age alone, as children of the same age can vary significantly in size.

Understanding Children's Clothing Sizes

Children's clothing sizes in the UK are primarily based on age, but this can be misleading since children of the same age vary considerably in height and build. European sizing uses height in centimetres as the primary measurement, which is generally more accurate.

American children's sizes use a similar age-based system but differ slightly in the measurements they correspond to. For toddlers (ages 2–4), US sizes are often labelled with a "T" suffix (2T, 3T, 4T). For older children, US sizes typically run one size smaller than UK equivalents.

For school uniforms, most UK retailers offer sizes by age with slim, regular, and plus-fit options. If your child is between sizes, it is generally better to choose the larger size and have it adjusted if necessary, particularly for school trousers and skirts.

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