To find the right size jumper or cardigan for your child, you will need find their chest size.

To take your child’s chest measurement, measure around the fullest part of their chest. For younger children, place the tape measure a few inches below their armpit and measure their chest there. For older children, particularly girls, the fullest part of their chest might be a little lower. Your child will be able to tell you what feels comfortable to them. Be sure not to pull the tape measure too tight as this can lead to buying shirts or blouses which are too small and strain at the buttons.

Jumper & Cardigan
Size	Chest Size (inches)	Chest Size (cm)	Age Guide
3/4	20/22"	51-56cm	3-4yrs
5/6	22/23"	56-58cm	5-6yrs
7/8	23/25"	58-63cm	7-8yrs
9/10	25/27"	63-68cm	9-10yrs
XXS	28/30"	71-76cm	11yrs
XS	31/32"	79-81cm	12yrs
S	32/34"	81-86cm	13yrs
M	34/36"	89-91cm	14yrs
L	38/40"	96-102cm	15-16yrs
XL	42/44"	107-112cm
XXL	46/48"	117-122cm