As babies grow quickly, it can be pretty tough to know what size they are at any given time! To keep it as simple as possible, you can use our handy sizing chart below. If you're buying the same size as usual, know that all sizes on the website are in standard American sizing.
The chart compares American sizing to other common sizing guidelines (i.e. UK, European) as well as comparing American sizing guidelines with the approximate age, height, and weight of your child.
If your child’s height and weight don’t match up on the chart, always go for the larger size (i.e. if your child has a height of 25 inches but a weight of 17 pounds, buy clothes that are 6-9M).
Standard American Sizing for Toddlers & Babies!
Child's Average Age
Newborn
3 months
6 months
9 months
12 months
18 months
2 years
3 years
4 years
5 years
Average Height
(in inches)
Under 24
24-26
26-28
28-30
30-32
32-34
34-36
36-39
39-41
41-44
Average Weight (in lbs)
Under 12
12-16
16-20
20-24
24-28
28-30
30-32
32-34
34-38
38-42
US Size
0-3M
3-6M
6-9M
9-12M
12-18M
18-24M
24M
2T
4T
5
UK Size
Newborn-1M
3M
6M
9M
12M
18M
23/24M
2A
3A
4A
European Size
56
62
68
74
80
86
92
98
104
110
Australian Size
0000
000
00
0
1
18M
2
3
4
5
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