Running & Breastfeeding don't mix!
I was a 32a pre-Prego and now 34c 8weeks pp breastfeeding. Holy Hell!! I have an all new compassion for big breasted women and high impact bras (and I'm still not that big)!!
Tip: Tried wrapping my c-section abdominal binder tight around my boobs before running and it worked wonderful! Highly recommend it for running!