Sizes: newborn (considered 0-3 (newborn), 6 (considered 3-6 or 6-12), 6-12, 12-18, and 24 months. Sizes vary a little by the brand I can get in the colors. I mostly use Rabbit Skins. Orange or Royal Blue onesie with your choice of embroidery. Soft all cotton onesie, we were thrilled to find orange and royal blue, in the past we were limited to white. We are licensed University of Florida crafters and a percentage of our sales go back to the university. Go Gators!