Sunny snug-fit sixe
Height of child
Weight of child 
Sunny Reccomendation
SIZE 2
30-32 in 24-27 lbs 0-24 months
SIZE 4
32-38 in 26-33 lbs 2 year olds-avg 3 year olds
SIZE 6
38-42 in 32-38 lbs Above avg 3 year olds - avg 5 year olds 
SIZE 6X
42-44 in 35-40 lbs Above avg 5 year olds - avg 6 year olds
SIZE 8
42-46 in 37-48 lbs Above avg 6 years olds - avg 8 year olds