Actually, I dont know. The size is for 3-6 month kids but that always depend of the baby. There are kids bigger than others and therefore, they need a large size. But if your child is in the average, this will be useful when he is around 3 months. I recommend you just bet if you think your baby will need 3 months clothes from now to spring. Thank you very much for your interest. Good luck with the auction if you decide to bet :)