Pregnancy sickness that prevents eating generally does not affect the development of the fetus if the pregnant woman does not have serious comorbidities. If there are electrolyte disorders will affect the development of the fetus. 1. does not affect the development of the fetus: pregnant women in early pregnancy, because the body blood human chorionic gonadotropin levels rise, will lead to nausea and vomiting and other early pregnancy reaction. If the symptoms are mild, do not affect the normal life of pregnant women, and do not lead to serious complications, such as ketoacidosis, etc., generally will not affect the development of the fetus. 2. affect the development of the fetus: pregnant women who have severe vomiting, long-term intake of nutritional deficiencies, which can easily lead to electrolyte disorders, ketoacidosis, severe anemia and other serious complications at this time is likely to lead to pregnant women to have a miscarriage or affect the development of the fetus caused by the possibility of embryonic stagnation. It is recommended that pregnant women who experience severe vomiting in early pregnancy should go to the hospital as soon as possible, and if necessary, be given relevant rehydration, acid correction and other treatments.