Anger or crying during pregnancy, once in a while may not have much effect on the fetus, if often emotionally unstable, anger or crying will affect the normal development of the fetus. Pregnant women are more sensitive during pregnancy, easily due to small things appear mood swings, occasionally angry or crying generally will not affect the fetus. However, if a pregnant woman’s mood swings are unstable for a long period of time, it will cause the endocrine environment to become dysfunctional, resulting in the blood supply of the placenta being affected, and changes in fetal breathing, heartbeat, and blood pressure, thus increasing the burden on the fetus’s heart, which will result in the fetus’s brain being underdeveloped and developmentally delayed. Therefore, it is recommended that during pregnancy, pregnant women should maintain an optimistic attitude. At the same time, try to avoid prolonged emotional depression or fluctuation, so as not to affect the growth and development of the fetus in the abdomen.