Normal poops?

Hi moms! My baby turned 6 months two weeks ago. And in the past few days his poops have changed quite a bit. Frequency and texture. He is exclusively breastfeeding. He usually pooped once or twice a day and then went 2 or 3 days without pooping. A couple days ago, he pooped in the morning his usual mustardy color and texture, which seemed pretty normal to me. After that tho, a couple hours later, he had another “pooped” diaper, but this one seemed a little more olive color and a different texture (will post picture below). Since then he has been pooping every 3 to 4 hours and his poops have been gradually changing color and texture. Currently they look bright green and a little more pasty. (Will post picture in the comments). I guess I am wondering, is this normal for their age, given that their digestive system is maturing? Should I be concerned and treat it as diarrhea, maybe take him to the doctor? He has two teeth that came out two weeks ago. My diet hasn’t changed at all. I don’t know if I should worry or if this is normal. Thank you in advance!