I am very new at owning pets..and one of my new kittens who is 8 weeks old, just pooped up green colored diarrhea. He kept meowing. Instead of pooing in the litter, he pooped in a plastic bag besides it. He was all playful before,and after he drank some milk, it seemed like he got a bit tired. Now he is sleeping and resting. So any advice of what to do with him to make him get better?I'll see if I can send him to the vet tomorrow.