Green poop in breastfed baby?

I’m a FTM with a 12 week old boy who is EBF. His poops are always yellow, mushy/seedy. I just changed his diaper after a nap and saw this. What the heck?! Is this normal? Should I be concerned? He has no other symptoms and behaviorally he is acting normal. He had a large, normal poo earlier this morning, and usually has 1-2 fuller poopy diapers a day.