Well your baby should definitely be eating every 2 and a half to 3 hours even if you have to make em' wake up, he should be eating. And if your nursing or bottle feeding breast milk the baby should actually poop multiple times a day now if its formula it takes longer to get through the baby system ...but he should be pooping.
It's perfectly fine to bottle feed. My son alternated between bottle and breast from 4 days old. Some people worry because they say baby will get confused and not latch well, but I haven't known anyone personally who had that issue.
Its breast milk and, that was my concern because he should be pooping and he's not.. I'm hoping by doing it through the bottle he'll poop, or it'll make a difference..