Hi ..
I had my nipple pierced, and just wore a plastic retainer, I cannot say tho it didnt get in the way, it did !
So, much so I took it out. I dont regret it at all, I guess I thought baby came first. I had the piercing for many years and enjoyed it whilst I had it.
Theres no reason you cant breast feed with one, its personal preference I guess.
Rgds
Guadagnia