Run a little big, would probably fit 3 months depending on size 4-Piece Pride Onsies with Buttons Closure - 03 Month Perfect for layering or wearing alone, with these pride-inspired 4-piece set of onsies, come in a variety of multi-colored options! They come with secure buttons for easy wear and take off, perfect for newborns ages 0-3 months. This set is ideal for giving your baby enough stylish looks. - Short sleeve pride themed onsies button close multi colors - 4 pieces - 03 month. #onesie #onsie #summerwear #babystyle #endlesssummer