My babies weighed 8 pounds each, born at 39 weeks. I've never had a singleton, so I can't compare.
I ate a LOT, throughout the day. At one point I kept track, and discovered I'd had 11 feedings in a day (not a meal - there wasn't room in my stomach to eat a lot at once). A feeding might consist of yogurt, a big serving a broccoli, a piece of peanut butter toast, etc.
If the chips are down, the buffalo is empty.