I have been experiencing tenderness and soreness in my smaller sized breast. I can't sleep on it as it hurts and i have my arm underneath me to create less pressure when i sleep on my tummy. I have had an issue with my smaller breast for a while now but i spoke to a friend who has told me to talk to my mum about it and see what she thinks. I have told my friend that i would not breastfeed with the tender breast as im afraid it will hurt or cause my baby or breast harm. This doesnt happen during or before a period and i have felt around for lumps but i have found nothing.