Note these jackets are a smaller, snug fit.
Size 1 : suitable for a larger baby to wear from 7mths old - 12mths
Size 2 : suitable for a 1 year old - 1.5 year old
Size 4 : suitable for a 2 year old - 3/4 year old
Size 6 : suitable for a 4 year old - 5.5 year old