I've been breastfeeding my newborn for 3 weeks. More recently, she makes a loud clicking noise during feedings. My nipple sometimes is pancaked when she is done or has a line down the middle. She is harder to latch by myself as she likes to suck on her hands instead of going for the nipple. My nipples feel like they are stinging when she's done and a sharper pain during her nursing. Any ideas if the clicking is positional due to a poor latch or due to milk let down?