It's way more time consuming to pump and then bottle feed a newborn. Think about it like this: if you are exclusively pumping you might spend a good 18-20 hours a day/night on just pumping then bottle feeding. It could take 45 minutes to pump just one breast, then another 45 minutes to feed the bottle to a newborn baby...every two to three hours...plus, for whatever reason, when you pump so early it's hard to keep up your supply. I tried pumping exclusively when I couldn't breastfeed but I couldn't keep up my supply. That's what eventually killed it for me.