I received this as a gift and put it away without using it. I only realized it after my child outgrew it. It says 9m, but to confirm the size for the listing, I tried it on my 2-year-old, and it was a bit tight. So, I think it can be used up to around 1 and a half years old. Ralph Lauren navy bucket hat, made in India. - Brand: Ralph Lauren - Manufacturing Country: India - Size: 9m - Color: Navy - Style: Bucket Hat Thank you for looking.