Ay, normal lang yan sa formula-fed babies actually, hindi sila kasing-frequent ng breastfed babies, so 1 day without poop shouldn't worry you too much! But just to be safe, I'd suggest checking with your pediatrician kung medyo stressed ka pa rin, especially if baby seems uncomfortable or the poop when it comes ay matigas na. Ganyan talaga ang first few weeks, everything feels like a potential emergency haha, you're doing great, mama!