I'm 28 and have a 13 month old DS. For the first 5 months we co-slept and he slept on my chest and that is when I first started to feel the ache, if he was asleep on my left breast I would have to move him as it would start to hurt (a dull ache) but I never had a problem with my right.
DS no longer sleeps that way but I still experience the pain about once a day for 10 minutes or so, but the pain has beeen constant for the last week. I don't think its anything to really worry about as I haven't found any lumps but I am just looking for some reassurance to see if anyone else has experienced this and what it might be.
I am booking the doctors tomorrow for something else so will mention the pain when I go but I know I won't be for another week or so until I get an appointment.