During pregnancy, you should not dye or perm your hair because the chemicals used to dye and perm your hair can affect the growth and development of the fetus, especially in the first three months of pregnancy, dyeing or perming your hair can lead to an increase in the rate of fetal malformations, and in the middle and late stages of pregnancy can lead to fetal growth retardation or affect the development of the fetal nervous system, resulting in abnormal fetal growth and development. During pregnancy, you should pay attention to good habits, try not to contact toxic and harmful gases, objects, drugs, and eat more nutritious food, in order to facilitate the growth and development of the fetus and produce a healthy baby.