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“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.