Baby Clothing Size Calculator: Newborn to 24 Months by Weight and Length
Free tool · Updated October 2, 2026 · By CouponTalk
Your result
Enter your measurements to see your result.
Quick answer
Baby clothes are sized by weight and length, not age, because babies grow at different speeds. A baby who weighs 6 kg and is 63 cm long fits 3–6 months (EU 62–68). When the weight and length point to different sizes, choose the larger one. Babies grow fast, so buy only a few pieces in the current size and more in the next size.
How to measure
- Weigh your baby, or use the latest weight from the doctor's visit.
- Measure length lying down, from the top of the head to the heel.
- Use the size shown; if the two point to different sizes, take the larger.
Baby Clothing Size Chart
| Size | Weight up to | Length up to | EU size |
|---|---|---|---|
| Newborn | 3.6 kg | 55 cm | 50–56 |
| 0–3 months | 5.7 kg | 61 cm | 56–62 |
| 3–6 months | 7.5 kg | 67 cm | 62–68 |
| 6–9 months | 9.3 kg | 72 cm | 68–74 |
| 9–12 months | 11.1 kg | 77 cm | 74–80 |
| 12–18 months | 12.5 kg | 83 cm | 80–86 |
| 18–24 months | 13.8 kg | 86 cm | 86–92 |
Sizes follow common international baby charts. Brands vary; check the weight range on the label.
Frequently asked questions
What size do newborns wear?
Newborn size fits up to about 3.6 kg and 55 cm. Bigger babies often go straight to 0–3 months.
Should I buy baby clothes one size up?
For gifts, yes. Babies outgrow newborn and 0–3 month clothes within weeks.
What is EU size 68?
It fits babies up to about 68 cm long, roughly 3–6 months.
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