My little guy was 6 months when we got these, he hates the sun and is very fair with red hair.  These do bug him to some degree, but they keep him from throwing his head around to avoid direct sunlight and do a good job of staying on.  Now that he is almost 8 months he's beginning to figure out how to get them off, but if he wants the sun in his eyes he can take them off.  I also like the lime color, its just fun and the band is quite comfortable.