Love the sunglasses, so very cute. They're light, safe and beautiful. I tried putting them on my 4-month old, they fit perfectly and make the baby look stylish and adorable. My baby doesn't like anything on her face though so she tries to remove them, they don't stay on her face for too long. But it's not the glasses' fault. The glasses are adorable, I recommend them. The Amazon description doesn't say but lenses are 100% UV protection.