My right breast seems to be producing almost no milk. I've been breastfeeding exclusively since my baby was born and he is now 3 months and 3 weeks old. I've also tried expressing at least once a day. When my baby latches on my right breast, he releases almost instantly and screams. I'd continue trying for at least a minute before giving up and offering the left side. Meanwhile, my left breast is almost 2 cup size bigger than my right one. I didn't think this was going to be a problem until his doctor mentioned that his growth rate has declined and suggested I feed him formula. I'm trying not to but feeding my baby from only one breast has left him screaming for more, especially in the evenings. Help!