When you first start pumping, your likely to experience a little tenderness. (exclusivepumping.com)
There may be a little tenderness when your baby first latches on, especially during the first few weeks, but it shouldn't last the entire feeding, and it should get better as the days and weeks go on. (verywellfamily.com)
It's normal for there to be a little tenderness in the first few days as your body adjusts to breastfeeding and as your baby gets the hang of it. (wendywisner.com)