The text book answer is that no one should have elective surgery or use Botox or fillers during pregnancy or breast feeding. This is because there are small potential risks, and no one is going to do studies to look at safety since no one really "needs" these procedures. That said, I'm sure you can find a surgeon who is willing to do your surgery, and likely there would be no complications and no effect on your pump supply. However, most surgeons would not want to take the risk that there could be any negative effects for you or your baby. Most of the surgeons who have strong opinions about avoiding surgery have never been pregnant and have never breast fed. There is a lot more trauma to the body from childbirth than from an upper eyelid surgery, so please consider doing what is best for you. Please just realize that there is a very small chance you could have a tougher recovery than expected. You have to be open to your baby being cared for by someone else and bottle fed if you have a complication. Best wishes.