Ok so my nearly 9 month old really bit me this evening while nursing. He just recently had his top two teeth pop out (and also has the two on the bottom). Ever since the teeth starting coming in he has occasionally sort of bit/nibbled a few times which was uncomfortable but this was a real chomp and it really hurt! My husband said he bit his chest earlier this evening too while lying on him. We have said NO firmly and I took a break from nursing when he bit. But then when I tried to nurse again he did it again! He also bit down on my shoulder while I was trying to hold him and calm him down.

Is this just a phase while he is adjusting to his new teeth? Is there something else I should do to help him understand not to bite?