I recommend going up a size if you are going to be
wearing a diaper under this onesie
XX-SMALL
Chest 26″ – 34″
Waist 27″ – 36
Length 26″
X-SMALL
Chest 30″ – 40″
Waist 30″ – 40
Length 27″
SMALL
Chest 32″ – 42″
Waist 30″ – 40″
Length 28″
Medium
Chest 33″ – 46″
Waist 33″ – 46″
Length 29″
Large
Chest 36″ – 50″
Waist 36″ – 48″
Length 31″
X-Large
Chest 38″ – 54″
Waist 37″ – 50″
Length 32″
2X
Chest 40″ – 60″
Waist 39″ – 52
Length 33″
3X
Chest 44″ – 62″
Waist 44″ – 58″
Length 33″
Waist 48″ – 62
Length 33″