The reason is as follows: 1. The process of hair pulling generally uses some chemical solutions, which may enter the bloodstream through the blood circulation of the mother’s scalp and enter the body of the fetus through the placenta, affecting the normal development of the fetus. 2. 3. During pregnancy, due to the needs of fetal growth and development, the pregnant woman’s need for various nutrients increases. If the nutritional intake is relatively insufficient, it will easily lead to the lack of various nutrients in the mother, and the mother may experience hair loss, and hair pulling will cause the symptoms of maternal hair loss to worsen.