Absolutely excellent for our baby.
I imagine each case will be a bit different because the fundamental aspect of this purchase is not only the quality of the product which is very high and uniquely designed, but will the baby feel comfortable with these glasses on and will he or she wish to keep them on. I can state that, at least ,our baby seems to enjoy them and the strap at the back works well,but just like many other things that are introduced to very young children --it should be a bit at a time. Short sessions with the glasses easily have turned to short trips in the sunshine

So far my little boy who is 2 wears them anytime were driving. He keeps them on and has fallen asleep many times with them on. A great investment. The only negative is the lens appears to be a bit scratched in places but not sure if that is preventable with a 2 year old manhandling the glasses.

So far so good
They look a bit dorky (wouldn't mind some plain color schemes), but they work fine and the baby doesn't mind wearing them. They stay put pretty well. I was concerned about the sizes offered, but they smallest seems to fit my 5 month old well. She does have a small head though. We'll see how long they fit for.

These look really cool
I ordered these because so many others we looked at had reviews saying they wouldn't stay on the child's face. These glasses stay on my son's face, otherwise fit well, and look seriously cool on him.

Only sunglasses we buy!
This is our third pair of Julbos. Our 2 year old daughter has had 2 pairs- her first ones at about 4 months and then we bought the next size up when she was 18 months. The most recent pair is for the baby on the way! They are very well made & most importantly she keeps them on. I love the hinges do not break and there is no "right side up". Besides they are way cute on her!