When my kids did that, I didn't just unlatch and say no. They got put on the floor and told that hurts, no nursing if you can't be nice. They cried a little, but within days it was over. Toddlers are old enough to learn nursing manners!
For the mastitis she might need antibiotics if it's not getting better.
Eta: for my kids at least, they did it to see mommy squeal. It wasn't teething related, but that could be your friend's lo's issue.
Sent from my phone. Please excuse typos.
wife to Tim
mama to Matthias
, & Andrew
Last edited by whiteyacht; 11-22-2012 at 04:44 PM.