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Tiny newborn in a slightly roomy Mimou pink elephant romper — newborn vs 0-3 months baby sizes guide

Blog

Newborn vs 0–3 Months: Understanding Baby Clothing Sizes

on Jun 25 2026
“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.