Aww mama, green poop at 6 months usually means mabilis lang ang digestion, especially if nag-start lang kayo ng solids or may pagbabago sa milk, a few of us noticed yan din sa aming babies tapos normal lang after a few days. But since maliit lang ang dami at worried ka talaga, I'd really suggest checking with your pedia kaagad lang para ma-rule out if may upset stomach or something, kasi mas safe na makita ng doctor para sa peace of mind mo!