Baby Clothing Size Calculator
Stop guessing (and stop returning). Enter your baby's age, weight, or height and get the right clothing size in seconds — plus how much growing room to leave.
See the full size chart (age · weight · height)
| Size | Age | Weight (lb) | Height (in) |
|---|
This calculator gives general sizing guidance to help you shop and reduce returns — it is not medical or growth advice. See our full medical disclaimer. Every baby grows differently and clothing sizes vary between brands; when in doubt, size up for comfort and longer wear. Data reflects standard US baby & toddler apparel sizing.
Baby clothing sizes — FAQ
How do I know what size clothes my baby needs?
Go by your baby’s current weight and height rather than the age on the label — babies vary a lot and brands differ. Enter all three here and the calculator suggests the best-fit size.
What size should I buy for a newborn?
Buy light on the newborn size; many babies wear it only a week or two, and larger newborns may go straight into 0–3M. Keep the tags on so you can exchange.