Hi there, I can understand your concerns,as far as the darker facial complexion you are referring to is due to the hormonal changes in the body during pregnancy and one can t do much about it until the pregnancy is over. Secondly you cannot change or modify the complexion of the baby,it s something genetic although you should take multivitamins and Folic Acid advised by ur doctor to keep yourself and the foetus Healthy. I hope you would understand my point here. Thanks very much and all the best.