Brown eyes

Because of the thin wall of children's eyes, some parts can see through the pigment film, which looks brown, punctate or flaky. This is a normal reminder: in addition to the cornea, the part that can be seen outside the eyeball wall is roughly divided into four layers: retina, choroid, sclera and conjunctiva. The conjunctiva is transparent, and the white one seen outside is the sclera. Because the newborn's sclera is thin and passes through the inner layer of choroid, it is a pigment membrane, so it looks like a child.

Another possibility is pigmentation. If you have chocolate, soy sauce, smoking, drinking tea, coffee, cola or eating some other foods with high pigment content, pigmentation will occur.