Severe pregnancy vomiting and inability to eat has an effect on the fetus. Severe pregnancy vomiting reaction in pregnancy can not eat, nutrient and energy intake is reduced, may lead to slow development of the fetus, fetal acidosis and so on. Pregnancy vomiting reaction is mainly concentrated in early pregnancy, early pregnancy is the critical period of fetal neurodevelopment and other development, at this time if you can not ensure that the nutrient intake, may lead to the fetus does not get enough energy, slow development, or ketoacidosis, etc., leading to miscarriage. If early pregnancy vomiting is severe, it is recommended to avoid excessive intake of food at each meal, eat several times and only a small amount of food at each meal, while avoiding grease and odors, and paying attention to ventilation. In severe cases, pharmacological intervention is needed, including glucose, potassium and sodium lactate supplementation to maintain fluid balance. Antiemetic drugs such as vitamin B6 can also be taken. The occurrence of severe pregnancy vomiting requires timely consultation and treatment.