Green poop

Hi mommies, my son is 2 months old now drinking enfalac baby. His poop is dark green. Is this normal? I tried changing the formula milk lactogen last night. He doesn't want to drink as the taste differs I guess. Could anyone suggest what I should do? He vomited this morning once after drinking milk. Kinda worried. Do I need to just give him enfalac or do I need to try giving lactogen for a week? #firstmom #SeriusTanya #bantujawab #AskingAsAMom