I have a 3 week old daughter and I started breastfeeding right after her birth. I tried for a week or so until my nipples got really sore and cracked, due to a bad latch, so I started pumping exclusively until they healed. A couple of days ago I tried to go back to feeding her from the breast but it seems that I'm having the same problems as before and getting sore again. My daughter starts the feeding with a good latch but during the feeding it seems like her mouth gets tired, then starts sucking on the nipple. Any tips?