Is it safe to dye your hair while you are pregnant?

You should wait to color your hair until your second trimester because this is after the critical stages of your baby's organ development are complete. The Organization of Teratology Information Specialists have been studying this for some time and they have concluded that there are no reports of hair dye causing changes in human pregnancies.

http://www.babycenter.com/404_is-it-safe-to-dye-my-hair-during-pregnancy_3273.bc