The original said it was for a 6 month old and came in only one size. The finished chest measurement says 19 inches. The sleeves were supposed to be 5" or to desired length. I'm not sure of the overall length, it is not given in inches.
I think mine turned out what I'm calling 6 months as well. It is 19 1/2 " chest, overall length is 8 3/4" and sleeves are 5".