My kitten can't poop. It is 2-3 weeks old and is being nursed from a bottle. When he tries to have a bowel movement only a very small amount in liquid form comes out. I'm talking enough to fill the area between these parentheses ( ). He walks around crying and struggles to have a bowel movement. When he tries to poop or he poops just that little bit, his anus becomes distended. He hasn't had a regular bowel movement in hours and seems to refuse his bottle now. What do I do?