I bought these for my 4 and a half month old dughter for on holiday, I do not recommend them for this age as the strap does not adjust small enough to fit my babys head, they kept slipping down as were far too big and were not usable due to this fact. The frame was also a little too wide for a child of this age. I would guess they would not be much good until after the age of 1 year old due to the size of the strap. I will keep hold of them until my daughter is older though as they are cute glasses and I do like them - shame about the sizing!!!