The effect of high mood swings of pregnant women on the fetus is the possibility of intrauterine hypoxia, miscarriage or preterm labor. The mood of the pregnant woman after pregnancy is directly related to the intrauterine development of the fetus. When a pregnant woman’s mood is agitated, the fetus in the womb will also find some changes such as. 1. Intrauterine hypoxia: When pregnant women have big mood swings, such as pregnant women making a lot of noise, etc., it makes the pregnant women’s heartbeat and respiration speed up, which may lead to a decrease in umbilical cord blood flow and a decrease in the amount of oxygen transported, etc., and ultimately, there will be intrauterine hypoxia of the fetus. 2. Miscarriage or preterm labor: early pregnancy pregnant women mood swings, will stimulate uterine contractions and lead to an increased risk of miscarriage rate, middle and late pregnancy, inducing frequent uterine contractions, the occurrence of vaginal bleeding, the mouth of the uterus to open, leading to preterm labor and so on. Pregnant women during pregnancy must pay attention to maintain a happy mood, avoid emotional fluctuations, if you find abnormalities need to go to the hospital in time for examination.