Most new mothers don't understand why their infants suddenly start the biting habit while breast feeding, but not only at breast feeding, sometimes infants try to put everything they get hold off into their mouths. I myself didn't know why when i was a first time mom but was experienced enough to know all about it for the second kid of mine.
This comes with the possibility of teething which is the most common reason and those once contended babies no more remain the same, turning cranky and restless sometimes, 24 into 7. They do it to get the soothing sensation on their gum's and not out of vengeance, so don't worry it would stop soon. You got to find solutions to help him ease the irritation and pain. Moreover, your constant comfort would provide him more relief.
Very rarely this turns out a habit they get out of anxiety so never use it to give into his demands or let others do it to them.
Please come back soon for my teething and biting solutions :-)
