Why do Chinese babies have ..

All newborns of Chinese descent are born with slate blue colored deep skin pigments that disappear by age three.

Not all Chinese newborns have them. Mongolian spots are a birthmark that appear on many darker-complexion children, but certainly not all of them. They grow out of them, like many birthmarks.

not just chinese babies all babies! My kids are 1/2 black and have them! The doctor says its all babies that are not of white origin that have these pigmentations.

My children has them and we are black.

A blue-black area or areas of skin, mostly on the lower back and/or buttocks, first seen in the neonatal period. Sometimes it is widespread on the back, or might be on the shoulders. It is due to melanin pigment in the dermis.

The blue-black area is flat in the skin (not raised) and is often 1 to 2 inches in diameter, and does not have a distinct border. It is non-tender, and is generally seen in black, Asian, or Latin babies. Caucasian babies occasionally have this condition.

My son has one and he is not Chinese. His father and I are of Hispanic descent.