I would like to get a TCA peel done, but I just had a baby and I am breastfeeding. ...
Although there is not a great deal of evidence on the subject, it is always safest to assume that any substance can affect breast milk. Since the peel is elective and can be done at any time, I would wait until after you are finished breastfeeding and then have the peel if that is the approach to facial rejuvenation that is recommended by your plastic surgeon.
I would not recommend performing a peel or other operative type procedure until finished with breast feeding.