Baby, Infant, and Toddler Clothing Sizing

Baby & Infant

Sizing for baby clothes is based on months, which is then based on the sizes of average babies at specific ages (some babies will be bigger or smaller than the average).

If the size only gives one month instead of a range, it will be the same size as the higher end of the range. For example,  6 Month clothing would be the same as 3 to 6 Month.

Baby clothing can be denoted with an "M" after the month number. For example, "6M" would be a 6 Month clothing size.

Consider purchasing the next size up if your baby's on the verge of  the max length and/or weight. They'll grow into it very quickly, and it will save you from having to purchase another size in the very near future.

Clothing Size

Average Age

 Baby's Length

Baby's Weight

Newborn Birth to 2 Weeks Up to 21.5 inches 5 to 8 lbs
0 to 3 Months or 3 Months 2 weeks to 3 months 19 to 23 inches 8 to 12.5 lbs
3 to 6 months or 6 months 3 to 6 months 24 to 26 inches 12 to 15 lbs
6 to 9 months or 9 months 6 to 9 months 27 to 28 inches 16 to 18 lbs
9 to 12 months or 12 months 9 to 12 months 29 to 30 inches 19 to 20 lbs
12 to 18 months or 18 months 12 to 18 months 31 to 32 inches 21 to 23 lbs
18 to 24 months or 24 months 18 to 24 months 33 to 35 inches 24 to 28 lbs



Toddler clothing sizes are based on children's ages in years. You can tell it's a toddler size by the "T" after the number. Like baby clothing, consider purchasing the next size up if your toddler's close to the max height and/or weight. They'll grow into it quickly, even if just a little big to begin.

 Clothing Size

Average Age



2T 2 years old 33 to 33.5 inches 24 to 28 lbs
3T 3 years old 34 to 38.5 inches 28.5 to 32 lbs
4T or Childs XS 4 years old 39 to 41 inches 33 to 36 lbs

If any questions on clothing sizes for your little one, please feel free to contact us.