You can keep them in if you're comfortable. It should not cause an issue with nursing, unless there is excessive scarring, or severed ducts. You WILL need to remove the jewelry for EVERY feeding though, and I've heard moms say that sometimes, milk will come out of the pierced holes in addition to the other parts of the nipple that milk comes from. It's nothing to worry about, but I'm sure you'd rather not be taken by surprise if it happens.
at 6:28 PM on Apr. 9, 2011