Baby's crystalline lenses do not filter out ultraviolet light, which can damage the retina.They should pay attention to protect their eyes, so it is necessary to wear sunglasses when going out, especially at noon.
Baby's crystalline lenses are more transparent than an adult's, so it is indeed more vulnerable to uv radiation. The eye is the most sensitive part to ultraviolet rays. If exposed to the hot sun without any sunscreen, it will cause vision loss and lead to ultraviolet conjunctivitis. Thus they certain need high quality sunglasses.