As an Ob/Gyn physician, I would advised that you do not start QWO injections while you are breastfeeding. As a QWO provider, I don't believe the company has done enough studies (especially in BF individuals) to ensure there is no passage into the breast milk and/or or harmful effects to the baby. I I would not recommend that any injectable (eg QWO, toxin, filler) be started while still BF, as no company will ensure the absolute safety of its product(s) in a breastfeeding individual. Any injectable can induce a reaction in the body, and how the body responds to that "foreign body/substance" is going to be different for each person, and thus possibly affecting the breastmilk and/or passing through the breastmilk. I would wait until your BF is done to start any injectable, especially QWO.