Our son is 10 months, but quite big (tall and full). The costume is precious on him. He isn't sure he loves having the hood part on his head, but the rest is fine. It was a little difficult to get his arms in the arm holes, but once in - he was fine. This will be our Christmas card photo, as well as our Halloween costume. The costume comes pre-stuffed...so the belly you see on the baby in the picture is actually part of the costume - no need to stuff newspaper in it. We are hoping for a cool Halloween because the costume will be warm with the hoodie.  Very precious!