Women who are pregnant are not recommended to dye their hair. Generally speaking, the hair dye used is still mainly chemical composition, hair dye through the scalp, or a small amount of absorption into the body, therefore, it is not very recommended to go for hair coloring during pregnancy, especially in the first trimester of pregnancy. Therefore, it is not recommended to dye hair during pregnancy, especially in the first trimester. The first trimester of pregnancy is the most vulnerable period of the fetus, and it is also the most sensitive period to all kinds of toxic and hazardous substances from the outside world. In the whole pregnancy, do not go to contact with toxic, harmful, radioactive things, mother-to-be quit smoking, quit drinking, pay attention to a balanced diet, nutrient intake balance, in most cases, can meet the needs of the fetus during pregnancy and safely through the whole pregnancy. You can dye your hair after giving birth and without breastfeeding.