Girls, hello everyone. The baby's stool has been green and thick one day…

Girls, hello everyone. The baby's stool has been green and thick one day, then thin and watery the next, with yellow mixed in, also thick and watery. We go 2-3 times a day. I'm attaching a photo of the stool from the last time. I apologize in advance. Is this normal? We are 4 months old. Does the baby have tummy pain or teething? About 10 days ago, the temperature was 37.7 for 2 days, neither high nor low.