The chemicals in permanent and semi-permanent hair dyes are not highly toxic. Most research, although limited, shows it's safe to colour your hair while pregnant. Some studies have found that very high doses of the chemicals in hair dyes may cause harm.
Is bleaching hair during pregnancy safe?
It should be fine to bleach your body hair during pregnancy. There's no evidence that using bleaching products will harm your unborn baby. Hair bleaching products contain dilute hydrogen peroxide mixed with ammonium hydroxide.
When can you get your hair highlighted when pregnant?
Overall, hair treatments are generally considered safe to use during pregnancy. However, you may also consider getting highlights or using pure vegetable dyes. Regardless, your safest option is to wait at least until after the first trimester, if not until after pregnancy.
Is it OK to dye hair during pregnancy?
Although fairly limited, most research indicates the chemicals found in both semi-permanent and permanent dyes are not highly toxic and are safe to use during pregnancy. In addition, only small amounts of hair dye may be absorbed by the skin, leaving little that would be able to reach the fetus.