Ay normal lang yan, mama! Formula-fed babies often have darker, greenish poop compared sa breastfed babies kasi ng iron content ng formula, so don't worry. Pero if your baby seems uncomfortable, may diarrhea, or you're still unsure, better check with your pedia just para sure, a few of us sa mommy group did the same at the doc assured us it was fine din, pero peace of mind talaga ang importante, di ba?