If a woman’s mood swings are slightly high in early pregnancy, it will not have a negative impact on the growth and development of the fetus. If a woman continues to have high mood swings in early pregnancy, such as too much happiness or too much sadness, it may have a negative impact on the development of the fetus, which may lead to embryonic abortion, spontaneous miscarriage, as well as a higher chance of pre-eclampsia and fetal development malformations. In the early stages of pregnancy, and even during the whole pregnancy, women should maintain a relaxed mood, exercise appropriately to enhance physical fitness, ensure sufficient sleep, and also increase nutrition appropriately, and diversify their diet to supplement the body’s needs for protein, vitamins and minerals. It is also important to do the maternity checkups on time during pregnancy to dynamically observe whether the fetal growth and development is in line with the gestational week, as it is not normal for the fetus to grow too fast or too slow.