Staying up late in early pregnancy will have a certain impact on the growth and development of the fetus, especially in the first trimester of pregnancy, the impact on the fetus is more serious. Pregnant women who often stay up late will lead to endocrine disorders, affecting metabolism, which is not conducive to the growth and development of the fetus. If you don’t get enough sleep during pregnancy, you run the risk of low fetal weight and other complications. It can also lead to the fetus not absorbing enough nutrients and may grow slowly after birth. When the fetus is born, it may have personality traits such as irritability, anxiety, anger and crying. Pregnant women must maintain good living habits and avoid overworking after pregnancy. Maintain adequate sleep and nutrition in order to ensure the healthy development of the fetus, and keep a relaxed mood in daily life to avoid excessive mental stress.