I have been working with a mother of a toddler, now 21 months, who has had repeated plugged ducts since he was 9 months old - none before that. They are always in the right upper outer quadrant (he is now only nursing on the right side), generally are painful, take up to 48 hours to resolve, and have, to her knowledge, never progressed to mastitis. I first spoke to her a month or so ago. At that time, she had tried most of the usual interventions for plugged ducts, was fairly knowledgeable, and stated that the usual heat, massage, etc., had never been helpful for her. She states that it usually seems to happen when he's doing the toddler thing of on-and-off, distracted, interrupted nursings. She is very careful to stop him and start over if he is not in a good position/latch. At that time, I recommended eliminating saturated fats and taking lecithin as per Ruth Lawrence, etc. She called back