Vomiting in pregnancy is mainly related to elevated HCG, excessive psychological tension and anxiety of the pregnant woman, as well as unbalanced nutrition of the pregnant woman, such as lack of vitamins, etc., which has little to do with the number of fetuses. If the vomiting is mild and does not affect normal eating, it is not very relevant and may not need treatment. However, severe vomiting is severe vomiting of pregnancy, which is a pathological phenomenon and requires treatment, such as giving rehydration fluids, nutritional supplements, e.g. amino acids, vitamins, fat milk, etc., and antiemetic drugs to correct the vomiting. If a pregnant woman always vomits repeatedly, it will affect the development of the fetus, so it should be treated.