How long after pregnancy do you recommend waiting before doing light laser or chemical peels? How long until hormones normalize?

While nothing from a laser will be transferred into the breast milk, the same cannot be said for the local or topical anesthetic that is often used for the procedure.  When you are done breast feeding, then it is safe to go forward with cosmetic procedures.  Just make sure you are not pregnant again at the time you decide to have treatment.  It does happen.

Many women are eager to begin laser treatments, chemical peels or light therapy after pregnancy. The wait time is not dependent on hormones normalizing, but how long you intend to breast feed. Unfortunately, studies examining the effects of these treatments on breast milk are few, if they exist at all. Many physicians would recommend waiting until you've stopped breast feeding before starting laser or peels.