This is the second hat I bought for my daughter, I'm a big fan of it. She's 3, so I bought the 2T-4T size. The last size was infant, which fit her up through last summer (2 1/2 years old). The hat seems to run a bit big (even with the adjustable strap in the back), which is great for a growing child, but I wish this hat had a chin strap for those windy beach days. I love the light weight fabric for getting wet at the beach/pool, it dries quickly, so you're child isn't in a heavy, wet, uncomfortable hat. I guess I'll be sewing on my own strap, but its a small price to pay for a hat I've been very pleased with. Also, we love the vibrant colors! You can find one that will match any bathing suit.