The difference between milk powder for pregnant women and pure milk Although milk powder for pregnant women and pure milk are both dairy products, they have certain differences in formulas and ingredients. Generally speaking, the formula of milk powder for pregnant women will contain more nutrients needed during pregnancy, such as folic acid, calcium, iron, protein and vitamins. Pure milk is relatively simple and only contains nutrients such as water, protein, fat and calcium. In addition, milk powder for pregnant women also contains probiotics such as lactobacilli or prebiotics that can promote absorption.