Blog

Mother holding her baby in a Mimou embroidered denim flutter romper — US vs UK vs EU baby clothes size conversion guide

Blog

Baby Clothes Sizes Explained: US vs UK vs EU Conversion Guide

on Jul 25 2026
Is a US “3M” the same as a UK “0–3 months”? What does an EU “62” mean? Baby sizes are labelled differently across the US, UK and EU and don’t line up neatly. Here’s how the three systems compare — and the one rule that cuts through all of it.