Bought the 2-3 year size for my large-headed 18-month old (always been in the high 90s percentile for head size since birth), and I think she's going to have as much trouble finding sunglasses that fit as her large-headed father. These weren't wide enough, but the earpieces are too long for me to fix the problem by just buying a size up.

But they also aren't very sturdy. Five minutes after I'd put the first pair on her, she'd pulled them off and twisted the left earpiece around so hard that the lens popped out. Took me 10 minutes to get it back in, but the hinge hasn't been straight ever since.

Still searching for sunglasses that my daughter can wear for more than five seconds.