breastfeeding woes

C • God`s protection 💟
Feeling a little dejected . I have sufficient milk supply for baby to latch on and she seems happy doing so , but it's making my nipples really sore. Even pumping now makes them sore now. 
My baby has jaundice and I'm worried she's not having enough if I were to pump. I dunno if I'm selfish to not let her latch on during this period of time. Thinking of pumping instead but not sure what amount is sufficient .
Any experienced parents can advice or share the amount a one weeker should be drinking during each feed? 
Really need help . Hoping her jaundice goes away too ... 😭