Infants, Toddlers, & Kids
Size Alpha Height in Inches Weight in lbs Chest in Inches Waist in Inches
Newborn   up to 18" up to 7 lbs up to 15 up to 15
0-3m   18-22" 7-11 lbs 15 - 16 1/2 15 - 18
3-6m   22-25" 11-15 lbs 16 1/2 - 17 1/2 18 - 18 1/2
6-9m   25-27" 15-18 lbs 17 1/2 - 18 18 1/2 - 19
9-12m   27-29" 18-22 lbs 18 - 18 1/2 19 - 19
12-18m   29-31" 18-26 lbs 18 1/2 - 19 1/2 19 - 19 1/2
18-24m   31-33" 22-29 lbs 19 1/2 - 20 1/2 19 1/2 - 20
2 XXS 33-35" 26-29 lbs 20 1/2 20
3 XXS 35-38" 29-33lbs 21 20 1/2
4 XS 38-42" 33-37 lbs 22 21
5 S 42-45" 37-43 lbs 23 21 1/2
6 S 45-48" 43-50 lbs 24 22
7 M 48-51" 50-57 lbs 25 22 1/2
8 M 51-54" 57-67 lbs 27 23
10 L 54-57" 67-75 lbs 28 1/2 24
12 L 57-60" 75-85 lbs 30 25
14 XL 60-62" 85-100 lbs 31 1/2 26

How to Measure Kid and Toddler Sizes:

Measuring Guidelines for Kids and Toddlers Height Stand child with feet slightly apart and their back to a wall. Measure from the floor to the top of their head for height. Measure child without shoes for best results.
Chest With arms relaxed at sides, measure child around the fullest part of their chest. Keep tape measure parallel to the floor.
Waist Standing straight up, measure child's natural waist. Keep tape measure comfortably loose and parallel to the floor.

How to Measure Infant Sizes:

Measuring Guidelines for Infants Height While lying down and legs extended, measure infant from top of head to bottom of feet.