This hat is great! Im glad that I took the time to read through the reviews as I took others suggestions and went with the child size (Medium / 2-5yrs). My daughter is almost 7 months and 17lbs. Naturally I was going to order the baby size. I didn't like that theres no mesh on the sides though. I was worried the child size wouldnt fit but it did. Although a tad big, it really does fit well. It will certainly last her several years too. In the pictures I have the medium size hat with the strap tightened all the way. Baby can see just fine and it stayed on her head! Great product! Read through reviews for sizing concerns. These hats are highly adjustable and it seems you can go up a size to get the most use out of it.