Hi, thanks for posting your query
occur due to stretching of the skin due to growing size of the uterus
within . It is not related to Baby's complextion.
Stretch marks can be avoided by applying moisturisers like shea butter or olive oil twice a day . But they are not totally avoidable .
Complexion depends on the amount of melanin
pigment which is genetically determined and not related to food.
Hope this solves your query