If you’re hoping to avoid having curls that look to be the result of electrocution for the entire nine months of your pregnancy, there are options to consider.
Many experts consider hair straightening treatments, or relaxers, to be as safe as using perms, bleaches, or hair dyes while pregnant. But again, there has not been enough research in this area.
Experts strongly recommend that pregnant women stay away from relaxers that contain keratin. Keratin treatments are commonly used for Brazilian blowouts, but keratin is found in many other straightening treatments as well. These products may contain potentially risky amounts of formaldehyde (source).
Some women choose to avoid relaxers during pregnancy and opt for blow drying and straightening their hair instead.