Green poop in babies can happen with certain formulas or even when they're getting both formula and breastmilk, so it's not always something to worry about, but since every baby is different, best to check with your pediatrician just to be sure everything is okay, especially if your little one seems uncomfortable or there are other changes in feeding or behavior. Most mummies find that once babies settle into a feeding routine, their poop colour and consistency sort themselves out, so jangan stress sangat lah!