T-shirt Sizes:     

     XS              S                 M                  L
    2-4             6-8            10-12             14-16
  Approx.            Approx.           Approx.              Approx.
15-25 lbs.    25-35 lbs.      35-45 lbs.      45-55 lbs.

   S           M          L          XL       2XL        3XL
34-36     38-40     42-44      46-48    50-52        54-56