Hmm, okay so yung dark specks sa poop, nakita ko rin yan sa aming baby dati, lalo na pag Nestogen ang formula! A few of us sa mommy group namin noticed it din, and honestly minsan it's just undigested formula or food particles, especially if gumagamit siya ng iron-fortified milk. Pero since mix feeding kayo, check din kung ano ang solid foods na binibigay mo, baka may contribution din yun. I'd say observe pa lang for now if okay naman ang baby mo, active, normal weight gain, at hindi may tummy issues, pero if concerned ka talaga or kung may iba pang signs like diarrhea or discomfort, mas better to ask the pedia just to be sure!