Human Color and Size Charts

More helpful tidbits:  

Onesies:               0-3      3-6     6-12     12-18

Length (inches)*   14.5     15.5    16.5      17.5

*sizes are approximate

More helpful tidbits: 

Tees:                     0-3      3-6     6-12     12-18    18-24

Length (inches)*     12      12.5      13         13.5        14

Width (inches)*      8.5       9         9.5         10         10.5

*sizes are approximate

More Helpful tidbits:

Tees:                       2T        3T        4T

Length (inches)*      14        15        16

Width (inches)*      11.5      12         13 

*sizes are approzimate