After pregnancy, due to changes in hormone levels in the body and changes in the organs and systems of pregnant women, pregnant women may experience various physical discomforts, as well as emotional fluctuations, irritability, aggravation, crying, conflicts with family members, and even quarrels. Pregnant women’s emotional changes can produce various undesirable hormones and biochemical factors, some of which can be transported to the fetus through the placenta and affect the development of the fetus. The effects of quarrels during pregnancy are mainly manifested in the following aspects: During pregnancy, especially in the first trimester, a pregnant woman who is always stressed and has a lot of emotional changes is going to affect the development of the baby. Studies have found that the IQ and weight of children born to women with poor moods and those born to women with happy moods are different; and the cortisol level in the body of pregnant women will increase significantly when they are depressed, and this hormone will inhibit the secretion of progesterone. It is known that progesterone is an essential hormone for the continuation of pregnancy and can prevent spontaneous abortion, that is, abortion caused by low progesterone levels in pregnant women. In addition, some studies have shown that the emotions of pregnant women also affect the development of the fetal nervous system, which can also cause abnormal fetal growth and development. Therefore, pregnant mothers should pay attention to regulate their emotions, try to avoid quarrels and anger, always maintain a healthy and happy psychological state, in order to create a good intrauterine environment for the fetus, and finally give birth to a healthy baby!