Ah mama, green poop sa mixed fed babies is usually normal, lalo na at ganyan kalaki ang LO mo, sometimes it's just how their tummy is processing both formula and breastmilk together! A few of us mums noticed din na if baby's feeding frequently or may slight tummy upset, the color can change like that, but honestly at 1-3 weeks pa lang, maraming adjustments pa ang happening sa system nila. Best to mention it to your pedia sa next check-up para sure, pero wag mag-alala muna, green poop is way more common than we think sa newborns! Congrats sa baby mo, first-time mommy struggles are real, pero you're doing great na!