Sizes, chest measurement (to fit/finished) and balls required

0-6 months - 16”/18 1/4” - 2
6-12 months - 18”/20 1/4” - 2
1-2 years - 20”/22 1/4” - 3
2-3 years - 22”/24 1/4” - 3
4-5 years - 24”/26 1/4” - 4