Hi mama! Dark green poop sa 2-month-old is usually normal, lalo na kung exclusively breastfed siya, yun ang meconium transitioning or sometimes it's just how their system processes milk, kaya don't worry too much. But since babies' poop colors can mean different things (bilirubin levels, feeding, etc.), best to mention it sa next checkup or text your pedia just to be sure, especially if may other changes like behavior or feeding. Your LO sounds happy naman if hindi siya fussy, which is a good sign! Let me know kung may iba pang concerns ka.