Size 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 Kid and Toddler
Height With arms relaxed at sides, measure directly under your armpits and around the fullest part of your chest and shoulder blades. Keep tape measure parallel to the floor.
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 Infant
Height While lying down and legs extended, measure infant from top of head to bottom of feet.