I like the product but I think this product is more for baby who are at least 3 months old and above.  The reason why I say this is because the strap doesn't get short enough to get get a nice fit on a baby that is too you young.  So keep that in mind it will probably not fit well on any baby under 3 maybe 4 months old.
That left aside the sun glasses look nice I bought for my brand new nephew his is only 2 months old now so I'm still waiting to have it on him with out having to hold the sunglasses to his face.
So if you buy this product please know that it will not fit a baby that is a new born under 3 months. Other then that the sunglasses are cute.