The nutrition of milk does not have much to do with the color, but normally yellow colostrum has a higher nutritional value. The first time a woman feeds her newborn after the end of labor is the colostrum, which is usually thick, yellow and relatively small, but it has a high nutritional value and contains a variety of immune proteins that can improve the immunity of the newborn, so the mother must pay attention to it, and it is best not to express the colostrum, which is a more nutritious milk. After the colostrum, the milk will be milky white, clinically known as mature milk, which is rich in fat and also contains lactose and other nutrients needed for the baby’s growth and development, providing calories to the newborn. Although the nutrients in mature milk are not the same as those in colostrum, they are just as important to the newborn.