Very cute little sunglasses! My little girl is 10 months and these fit her very well, the velcro can go tighter for smaller babies and there is room for when she gets bigger. She's worn them about 3 times now in her pram (about a 30 minute journey each time) the first time they left little marks on her nose so we put them on a bit looser. She has pulled them down onto her chin a couple of times and because she was in the pram we could easily replace them and she was happy to wear them the rest of her journey, we havent tried them in the car seat yet. She was happy to have the sun out of her eyes, very good product.