From Bonna to S26 gold

Uy, totally normal yan, Mama! When you switch formulas, lalo na ganyan kabigla, ang digestive system ng baby needs time to adjust, a few of us tried similar transitions and experienced the same thing. The dark/greenish poop is usually just because ng formula change and maybe some meconium still coming out, but since naka-pop na siya after 4 days that's a good sign na nag-adjust na. Since baby is 2 months pa lang, baka mas sensitive pa talaga, kaya next time puwede mong i-gradual ang transition over a week or so (mix old and new formula poco poco) para mas smooth. But if the poop stays dark or di siya regular pang, best to check with your pedia just to be sure everything's okay!