When it comes to deciding whether or not a Brazilian blowout is safe while pregnant, there are several factors to consider. Firstly, the active ingredient in most Brazilian blowouts, formaldehyde, should be avoided as much as possible during pregnancy due to potential toxicity. Secondly, inhaling chemicals used in hair treatments can be harmful both for you and your unborn baby. Lastly, pregnant women may also experience increased sensitivity to products that contain strong fragrances and other ingredients which could lead to skin irritation and allergies. Therefore, if you're considering a Brazilian blowout while pregnant it's best to consult with your doctor first before making any decisions.