My newborn kitten is not running around like usual. He barely moves and only rolls. He is not drinking anything. He has had diarrhea for days. This morning he is worse. What should I do?

Hi Virginia,
I would take him to the vet as soon as possible. Even if he is still drinking, with diarrhea over a period of days, he can become dehydrated very quickly due to electrolyte loss. It is possible he may have worms. Though regardless, if he is listless he needs to see a vet immediately.
Take care.