Baby & Toddler Clothing Size Chart by Age, Weight and Height
Looking for more than a chart? Our complete baby sizes-by-age guide adds a free size calculator, brand-fit notes and how many of each size to buy.
Getting the size right is the easiest way to love what you order. Use this baby and kids clothes size chart to choose by your child's age, weight and height — preemie to 4T. If your little one falls between two rows, size up for a little more room to grow (sleepwear is the exception — see the FAQ below).
Baby & toddler clothing size chart by age, weight & height
| Size | Age | Weight | Height |
|---|---|---|---|
| Preemie | preemie | up to 6 lb / 2.7 kg | up to 17 in / 43 cm |
| Newborn | up to 1 month | 6–9 lb / 2.7–4.1 kg | 17–21.5 in / 43–55 cm |
| 0–3M | 1–3 months | 9–12.5 lb / 4.1–5.7 kg | 21.5–24 in / 55–61 cm |
| 3–6M | 3–6 months | 12.5–17 lb / 5.7–7.7 kg | 24–26.5 in / 61–67 cm |
| 6–9M | 6–9 months | 17–21 lb / 7.7–9.5 kg | 26.5–28.5 in / 67–72 cm |
| 9–12M | 9–12 months | 21–25 lb / 9.5–11.3 kg | 28.5–30.5 in / 72–77 cm |
| 12–18M | 12–18 months | 25–28 lb / 11.3–12.7 kg | 30.5–32.5 in / 77–83 cm |
| 18–24M | 18–24 months | 28–30 lb / 12.7–13.6 kg | 32.5–34 in / 83–86 cm |
| 2T | 24–36 months | 30–33 lb / 13.6–15 kg | 34–36 in / 86–91 cm |
| 3T | 36–48 months | 33–36 lb / 15–16.3 kg | 36–38.5 in / 91–98 cm |
| 4T | 48–60 months | 36–40 lb / 16.3–18.1 kg | 38.5–41 in / 98–104 cm |
Compiled from brand-published size charts (Burt's Bees Baby, Carter's, Gerber and Gap; retrieved September 2026). Brands can differ by 1–3 lb on the same label — see how 30 brands compare in our Size Index 2026, or check the specific brand's own chart. Height shown in inches with the centimetre equivalent alongside for EU-labelled brands.
These are clothing-fit ranges, not growth targets or medical advice — every baby grows differently. For questions about your baby's growth, ask your pediatrician.
How to measure your child
- Height: stand them against a wall, heels flat, and measure from the floor to the top of the head.
- Weight: use your home scale — it's the quickest way to match a size for babies.
- Chest: measure around the fullest part, under the arms, keeping the tape snug but not tight.
Frequently asked questions
What age is "Newborn" size, and when should I size up to 0–3M?
Should I go by my baby's age, weight, or height?
What does "80" mean on European baby clothes?
Where do these size ranges come from?
Shop by age
Found your size? Shop soft, well-made clothing for every stage:
- Newborn (0–3m): Girl · Boy
- Baby (3–12m): Girl · Boy
- Toddler (1–3y): Girl · Boy
- Kids (3–7y): Girl · Boy
Prefer to browse by age group instead? See Baby (0–24 months) or Toddler (1–3 years).