The fetus in the first trimester of pregnancy absorbs nutrients primarily through structures such as the placenta and umbilical cord. During the first trimester, the embryo is present from the beginning of gestation to the 10th week of gestation, and during this period it is mainly undergoing organ differentiation. From the 11th week of gestation is the fetus, and this period mainly accomplishes further development. Once the fetus is formed, its gas exchange, nutrient supply, and fetal metabolite discharge are absorbed mainly through the placenta, umbilical cord, and other structures. However, fundamentally, the nutrition of the fetus comes from the mother, so during pregnancy, especially early pregnancy, the mother’s energy consumption, as well as the demand for protein, folic acid, various vitamins, iron and other elements will increase. Therefore, it is recommended to have a balanced and nutritious diet during pregnancy, and there is no need to pay special attention to dietary taboos.