Carbon dioxide laser, whether fractional or non-fractional, requires several days of healing. THere can be special requirements in post operative care depending on your individual course. You don't want to risk scarring or pigmentation problems and the hormones of pregancy can influence the healing. If there were to be special treatments, such as antibiotics by mouth, or topically, anti-viral medications, anesthetic, sedatives, to be used during and after the treatment, your doctor might not be able to use them if you were pregnant and it might compromise the treatment or final result. It is best to do such an elective cosmetic procedure after you have completed nursing your infant should you become pregnant, or when you are sure you are not pregnant and not trying to conceive.