Baby Size Chart: Clothes by Age, Weight, Length, Months & CM

Baby clothing size chart by months, weight, length and EU height labels with newborn, 0-3M, 6M, 12M and 24M guidance.

Baby clothing size chart by age, weight and length

Use weight and length as the primary fit checks for baby clothing, sleepers and bodysuits.

Size	Weight	Length / height	EU height label	Fit note
Preemie	Up to 5 lb / 2.3 kg	Up to 17 in / 43 cm	Up to 44 cm	Tiny newborn fit; brand ranges vary widely
Newborn	5-8 lb / 2.3-3.6 kg	17-21 in / 43-53 cm	44-56 cm	Short-term size for many full-term babies
0-3M	8-12 lb / 3.6-5.4 kg	21-24 in / 53-61 cm	56-62 cm	Good first size when newborn may be too small
3-6M	12-17 lb / 5.4-7.7 kg	24-27 in / 61-69 cm	62-68 cm	Check sleeper length
6-9M	17-21 lb / 7.7-9.5 kg	27-29 in / 69-74 cm	68-74 cm	Often overlaps 6-12M labels
9-12M	21-25 lb / 9.5-11.3 kg	29-31 in / 74-79 cm	74-80 cm	Measure length before buying footed items
12-18M	25-28 lb / 11.3-12.7 kg	31-33 in / 79-84 cm	80-86 cm	Transition toward toddler sizing
18-24M	28-30 lb / 12.7-13.6 kg	33-35 in / 84-89 cm	86-92 cm	May overlap 2T but cut is often diaper-friendly

Baby brands vary. Month labels usually mean up to that age, so a 6M item may fit many babies before 6 months if they are tall or long-torsoed.

Use age as a quick entry point, then verify by height and weight.

Age	Common size	Weight	Height	Best check
0-3 months	0-3M	8-12 lb / 3.6-5.4 kg	21-24 in / 53-61 cm	Use length for sleepers
6 months	3-6M or 6M	12-17 lb / 5.4-7.7 kg	24-27 in / 61-69 cm	Size up if near top of range
12 months	9-12M or 12M	21-25 lb / 9.5-11.3 kg	29-31 in / 74-79 cm	Check diaper room
2 years	2T	28-32 lb / 13-15 kg	33-35 in / 84-89 cm	Toddler cut
3 years	3T	32-35 lb / 15-16 kg	35-38 in / 89-97 cm	Toddler cut
4-5 years	4T, 4 or 5	35-49 lb / 16-22 kg	38-45 in / 97-114 cm	2T-5T to kid sizes transition
6-7 years	6-7 / YS	49-58 lb / 22-26 kg	45-50 in / 114-127 cm	Little kid range
8-10 years	8-10 / YM	58-80 lb / 26-36 kg	50-56 in / 127-142 cm	Youth medium range
11-13 years	12-14 / YL	80-115 lb / 36-52 kg	56-64 in / 142-163 cm	Youth to adult crossover

Age is the least reliable measurement for children. Height is usually the fastest way to improve accuracy.

Use current length and weight first; month labels are only a rough shopping shortcut.

For babies near the top of a range, size up for diaper room and quick growth.

Check head openings, snaps and footed-sleeper length because babies outgrow length quickly.

For baby shoes, measure foot length and leave gentle wiggle room rather than relying on age alone.

Move from 18-24M into 2T-5T sizing.

Measure infant foot length for first shoes.

Use the broader children apparel hub.

Should I buy newborn or 0-3M?

Use expected birth weight and length. Many babies wear newborn briefly, while larger babies may start in 0-3M.

What does 6M mean in baby clothes?

It often means up to about 6 months, but weight and length are more reliable than age.

Is 24M the same as 2T?

Not always. 24M is often baby-cut with diaper room, while 2T is toddler-cut and may be slimmer or longer.