I would think bf is better if the baby is jaundice, as formula fills them up more so they feed less often, and the best way to get rid of jaundice is to have constant feeds

My hospital had a pump, but i only used it once

I only bought one a few weeks after hospital, so you might not need it at all.. maybe hold out and get it only when/if you do. A lot of pharmacies sell them, so you can probably still pick them up at strange hours etc