Yes, it is possible to get a Brazilian Blowout while breastfeeding. However, it is important to keep in mind that you should always consult with your doctor prior to any chemical treatment or procedure if you are pregnant or nursing. While the Brazilian Blowout solution itself does not contain formaldehyde, ingredients such as methylene glycol and propylene glycol could be harmful during pregnancy and breastfeeding due to their potential toxicity profile. Therefore, it may be best for you to wait until after your baby has been born before getting the treatment done.