My child is average sized and will be 2 1/2 in December. Not sure if I should be buying size 2 or 3 since I don’t know what size 2 means. Till now just went by months (12-18, 18-24 etc).
Depends on a child, how tall and big.
My child is gonna be 2 end of summer, and currently wearing size 2. If I want it to pull through for entire season, I'll need to get size 3 for the winter. But mine is a little chubs.