My lactation consultant said that it shouldn't hurt like that if they are latched correctly. IDK. I had to have one of the nurses sneak me in some formula just so I could rest them

lol...I pumped when I got home from teh hospital and eventually quit producing milk because I just couldn't pump enough to supply enough to continue...plus it didn't help my supply that I was supplementing with formula....
I don't think it is anything to be scared about..but it's good to be prepared for it. You really have to be serious about breastfeeding to continue because if you have formula lying around its just too easy to use it and then your supply drops and its hard to try and get it back up....