Ay, hindi ka lang! Two months old babies on formula can actually go 2-3 days without pooping kaya don't panic pa, a few of us mums noticed this with S26 din, parang mas solidifying ang tummy nila compared sa breast milk babies. Pero since it's been exactly 2 days na talaga, maybe try gentle tummy massage or bicycling motions with their legs, or consult your pedia just to be sure everything's okay, especially since ito na ang pattern na nag-develop.