Brand Sizing Overview · Little & Youth

Baby clothing sizesHow Preemie–24 months compare, brand by brand — by weight

Baby sizes are set mostly by weight, then length — and the same '3–6M' fits a different baby at every brand. Pick a size below to see each brand's own published weight and length, from its own chart. Some brands label the same weight differently (3M, 6 mos, 62 cm); those are shown separately, as printed, never treated as the same size.

New to kids' sizing? Start here — why tops and bottoms can need different sizes, and when sizing up backfires.

Preemie & Newbornup to 8 lb · 39 brandsSee Preemie & Newborn sizing → 0–3M8–12 lb · 36 brandsSee 0–3M sizing → 3–6M12.5–17 lb · 37 brandsSee 3–6M sizing → 6–9M16.5–20 lb · 29 brandsSee 6–9M sizing → 9–12M21–24 lb · 15 brandsSee 9–12M sizing → 12–18M23–27 lb · 27 brandsSee 12–18M sizing → 18–24M27–30 lb · 25 brandsSee 18–24M sizing →

Know your child's size at every brand. Let Little & Youth do it.

Enter your child's measurements once and Little & Youth shows the size to buy across all 100+ brands on the site — each pulled from that brand's own published chart.

Find your child's size →

Their Measurements. Right Size. Brand by Brand.