Disney costumes size chart

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   27-31" 18-26 lbs 18 1/2 - 19 1/2 19 - 19 1/2
18-24m   29-33" 22-29 lbs 19 1/2 - 20 1/2 19 1/2 - 20
2 XXS 31-34" 26-29 lbs 20 1/2 20   
3 XXS 34-38" 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 24 3/4 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:

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:

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