For the first time pregnant mother-to-be psychological changes are great, early pregnancy, more or less nervousness, aggravation and depression are normal, but excessive bad emotions directly affect the fetus, is very dangerous Oh. 1, excessive mental tension is likely to cause fetal malformations and premature birth. Some pregnant women, especially primiparous women lack scientific understanding of pregnancy, whether they are up to the task of pregnancy, whether the fetus is healthy performance of excessive tension, as well as changes in social relationships, resulting in mood swings, excessive mental tension is likely to cause embryonic dysplasia, uterine contractions lead to miscarriage. 2. Excessive mental tension can cause severe pregnancy vomiting. Early pregnancy reaction is closely related to the increase of HCG in the body, gastrointestinal disorders and psychological factors. Severe vomiting can cause water and electrolyte disorders, and use body fat, causing metabolic acidosis. In serious cases, it can cause a drop in blood pressure, acute renal failure, Wernicke’s encephalopathy and other life-threatening pregnant women. 3, pregnant women nervousness will make their own immune system decline. Long-term emotional stress of pregnant women will have an adverse reaction to immunity, so that the body becomes weak, and weak people are easy to infect disease and thus affect the health of the mother and child. Therefore, every mother-to-be should understand that pregnancy is a happy little thing. It is important to pay attention to strengthening nutrition, diet and various external adverse factors to interfere, but also to prepare psychologically and mentally before pregnancy, learn to self-regulate, learn to control and improve the bad mood. Let the mood remain stable and happy.