Long-sleeved Romper Size：3M for 0-3 months 3M Length 50cm bust 25*2cm Shoulder to crotch 38cm Sleeve Length 22cm Recommended height59cm6M for 3-6 months 6M Length 54cm bust 26*2cm Shoulder to crotch 40cm Sleeve Length 24cm Recommended height66cm9M for 6-9 months 9M Length 57cm bust 28*2cm Shoulder to crotch 42cm Sleeve Length 26cm Recommended height73cm12M for 9-12 months 12M Length 60cm bust 29*2cm Shoulder to crotch 44cm Sleeve Length 28cm Recommended height80cmDue to different measurement methods may be 2-3 cm error.