I didn't bf DD1 so this is all new to me. I am nursing at each feeding, about 8-10 times/day. She is still hungry after each feeding so then I'm topping her off with formula or pumped milk. I would love to be able to stop giving her formula. Should I let her nurse as long as she wants or stop after 10/15 minutes? I am feeding both breasts at each feeding. Any tips or advice? Thanks.