My breast only hit a B cup for about 24 hours when my milk first came in. For most of the time I was breastfeeding, I was a small A. And breastfeeding had no effect on the appearance of my breasts, they still look mostly the same at 50 as they did at 25. My daughter gained over a pound a week on my milk, and my 11 lb son stayed above the 100th percentile and outgrew his infant seat at 4 months. The size of the breast indicates how much fat surrounds the milk glands and ducts, not the amount of milk they can produce.
From the way this was talked about on the news, I was expecting an older looking child.
I slept with all three of my kids. It started when the nurse brought my first baby to me, on the first night of being a mom. We fell asleep while she was nursing, and woke up 5 hours later. I thought "This is great!" and never tried to make her stay in her crib in the middle of the night. I got lots of sleep with my infants.
eta- I also breastfed the two younger ones until they were around 2, and I worked after they were 6 months old without any problems with adequate milk supply.