Hay, normal lang yan, mama! Ang babies on formula, especially with Similac Tummycare, usually may slightly darker at thicker poop compared sa breastfed babies, parang mustard or tan color, sometimes may small curds pa. Basta walang mucus, blood, or grreenish-greenish, okay na okay yan at wala kang alalahanin. Pero pag concerned ka talaga or feeling mo something's off, mas peace of mind mo pag checked ng pedia, lalo na first month pa lang ng baby mo kaya natural na maraming tanong hehe. Good luck, mama!