Age Height (inches/cm) Weight (lbs/kg) US Size EU Size UK Size
Newborn 18–21 in / 45–53 cm 5–8 lbs / 2.3–3.6 kg 0–3M 50 Tiny Baby
3–6 months 22–25 in / 56–64 cm 9–16 lbs / 4.1–7.3 kg 3–6M 62 0–3 months
6–12 months 26–29 in / 65–74 cm 17–22 lbs / 7.7–10 kg 6–12M 74 3–6 months
12–18 months 30–32 in / 75–82 cm 23–27 lbs / 10.5–12.3 kg 12–18M 80 6–12 months
2 years 33–35 in / 83–89 cm 28–30 lbs / 12.7–13.6 kg 2T 92 18–24 months
3 years 36–39 in / 90–99 cm 31–34 lbs / 14–15.4 kg 3T 98–104 2–3 years
4–5 years 40–43 in / 100–110 cm 35–40 lbs / 15.9–18.1 kg 4T 104–110 3–4 years
6–7 years 44–48 in / 111–122 cm 41–50 lbs / 18.6–22.7 kg XS 116–122 5–6 years
8–9 years 49–53 in / 123–134 cm 51–65 lbs / 23.1–29.5 kg S 128–134 7–8 years
10–12 years 54–60 in / 135–152 cm 66–90 lbs / 30–40.8 kg M 140–152 9–11 years
13–15 years 61–65 in / 153–165 cm 91–115 lbs / 41.3–52.2 kg L 158–165 12–13 years
16–18 years 66–70 in / 167–178 cm 116–140 lbs / 52.6–63.5 kg XL 170–178 14–16 years