Ay, don't worry too much, mama, two days is still within normal for formula-fed babies, though I'd definitely mention it to your pedia just to be sure, kasi sometimes the formula adjustment takes a bit and babies can get a little constipated. A few of us mums namin, when we switched to formula, observed na ang poops ng babies namin became less frequent compared sa breastfed, so it's actually pretty common! Just make sure baby is drinking well, hindi siya uncomfortable, and check with your doctor, better safe than sorry, lalo na first baby pa lang. Hang in there, mommy!