My situation is a bit different in that I'm working full time and my OH is a SAHD, so I would pump at the same time he'd give a bottle of EBM or formula. I couldn't pump enough for a full feed, so some of them would be formula. I breastfed him exclusively at night, before work, and also come home to feed him at lunch time. It got to the point that I was spending too much time at work pumping for only 2-3oz (total for the day), so I quit pumping and thus had to go to formula for all the day feeds. I continued to exclusively breast feed him at night, before work, and I still go home for a lunch feed.