My baby is 3weeks Old and 1 day. When I nurse him he sucks extremely hard and bites down with his gums. I know he is latched correctly because I've seen an lactation nurse and even tried a nipple shield. The pain is getting pretty intense...I definitely do not want to give him formula though so that's not even an option. I think he's just greedy with his milk lol! Does anyone else's baby do this? Any tips or advice?