My daughter has light blue eyes and would squint pretty hard at the sun. These are great for her. She is 8 months and has an average size head. The glasses are made of a soft rubber material which is a pro and a con. They flex to fit babies heads but they don't stay put the best, especially if your baby doesn't have a large nose bridge like mine. The fix was easy, I just purchase two glasses bands for children @ Walmart (you can probably find them on Amazon too, I just happened to look there) for $2.50 each, they are elastic and can be adjusted so they fit snugly to your child's head. It took her a bit to get the hang of them but now wears them with no issue when outside in the sun.