Infant Convertible Sleeper Size Chart

Infant Size Chart 
chest (in) length (in) Neck (in) sleeve length (in) 
0-3 months  8.5 in 21 in 4 in 7.75 in
3-6   months 9 in 23 in 4 in 8.5 in
6-12 months 9.25 in 26 in 4.5 in 10 in
12-18 months  9.75 in 28 in 4.75 in 10.5 in
18-24 months  10 in 30 in 5 in  12 in