Newborn hasn't pooped in 48 hrs

Took him to Dr yesterday..we were concerned he wasnt keeping anything down bc he spits up A LOT. they weren't concerned because he has gained 6oz in 7 days They said "he will probably poop today".... Well he still hasn't. Is this normal or what can I do? We are switching between formula and breastmilk depending on how much milk I can get out. And he's 12 days old

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