After pregnancy can be a simple trim, in order to adapt to the needs of daily care during pregnancy, you can trim your hair to the right length in advance, but it is not recommended to do hair such as perming, dyeing, straightening and other hairdressing operations that require the use of chemical agents, because the vast majority of perms and dyes on the market contain benzene, lead, naphthalene, silver nitrate, phenols and other toxic and harmful chemical ingredients. In the hairdressing process is very easy to be absorbed through the rich blood transport of the scalp, as long as a small amount of entry may lead to heavy metal substances in the body due to discharge difficulties and accumulation, the light dizziness, weakness, numbness, skin allergies, liver and kidney function damage, serious damage to the DNA in the nucleus of the cell, so that the corresponding tissue, organ cancer, during pregnancy may be affected by the development of the fetus in utero and teratogenic, miscarriage, fetal abortion and other adverse effects, During pregnancy, the development of the fetus may be affected, resulting in malformation, miscarriage, fetal abortion and other adverse consequences.