We recommend sticking to true size/age for the one piece pajamas. They run true to size and are designed to fit 2-3x longer than your average baby one piece pajama.


SIZE                     WEIGHT          HEIGHT
0-3 months          12-15lbs            21"-25"
3-6 months          15-18lbs            24"-27"
6-9 months         18lbs-22lbs        26"-30"
12-18 months     22lbs -26lbs       29"-32"