Poop

Hi mommies! First time mom here. Ask ko lang po is it normal for a mixed feed baby na hindi po magpoop for a day or two? 1 month pa lang po sya. I go to work na po kasi and minsan nagkukulang yung nappump kong breastmilk since di na po malakas milk supply ko. So napag isipan namin na magreserve ng formula milk just in case na maubos yung naiwan kong breastmilk in a day. Pero mas lamang naman po feed nya ng breastmilk. So normal po ba yun na in a day or two di magpoop si baby? Thanks po