Thank you for viewing! I purchased this when my child was 6 months old. It's one size for baby hats, but my child already felt it was small at 6 months, so I didn't use it much. I think it depends on the size of your child, but for my family, I felt it was just right before 6 months old. (My child was a bit chubby compared to the average) I hope this helps as a size reference♪ Please be sure to check the actual photos. * Free shipping ✨ * Immediate purchase is welcome * Welcome to bulk purchases, feel free to comment! ------✳︎✳︎Product Description✳︎✳︎ ------ Brand → Gelato Pique Size → Baby Free Size It's a warm fabric like fleece, perfect for hats in autumn and winter. ------------------------------------ ・Please understand that this is stored at home and will be shipped with simple packaging before purchasing (*´꒳`*)