MIMOU babywear

“Newborn” and “0–3 months” sound identical but are two different clothing sizes — and confusing them is a top reason outfits don’t fit. Here’s what each means by weight and length, which to buy and how many, and how to tell which one fits your baby.

A baby’s age tells you surprisingly little about what size they actually wear — weight and height tell you far more. Here’s a clear baby clothes size chart, why brand sizing varies so much, the practical rules that save money, and how to tell if something really fits.

Baby clothing sizes are inconsistent across brands. Here's the complete newborn clothes size chart with weight and height ranges, plus practical tips for always buying the right size.

Baby clothing sizes are confusing because there's no US industry standard and age labels are unreliable. Here's how to measure your baby correctly and always buy the right size, regardless of brand.