I do love these glasses. My baby boy looks so cute in them. I bought them for him when he as 4 months old. He wore them without a problem at first.  Now he is 6 months old and moving a lot more and putting everything in his mouth since he is teething.  I haven't been able to find a pair of baby sunglasses retainers to keep them on his head.  To be honest, I haven't looked that hard, but it would be nice if these $20 baby sunglasses came with an adjustable pair. Overall, I LOVE these glasses and know that he will get his use out of them living in Florida.