The chart below is a great guide for most kids but if you're stuck between two sizes then we strongly suggest choosing the smaller size as wetsuits have quite a lot of stretch and they're better snug than overly loose. 

Also, we offer 20% discounts on your second hand wetsuit, so you don't have to try to buy a size that will see your child through three years of growth.

If you do happen to choose a dramatically wrong size then don't sweat, let us know and we can exchange it.