I didn't realize how difficult it is to find a decent pair of sunglasses with a head strap for a baby.  These definitely work well, and my daughter, who is 12 months old, doesn't seem to mind them on her.  They adjust very easily, and seem to be comfortable enough for her to wear them on a long walk in her stroller.  She's also pulled them off without me noticing and played with them, and even with her pulling on the sides in either direction, they still hold their shape perfectly.