I have a baby chick, about 3 weeks old. He is about 1/3 the size of the other chicks. He's always been small, but seems to not have grown. He is drinking and eating. I put electrolytes and probiotic powder in the drinking water. He gets medicated starter fee. He has a protruding vent. Almost like a prolapsed cloaca, but too young, I think, to have this problem. I think he is a rooster. I gave him a little tiny bit of mineral oil as I thought that he might have some dried poop stuck as he was pushing a lot. His vent is very swollen and he looks weak, lethargic and his wings are hanging. I have him on a warming pad and covered. I make sure he continues to drink and eat. Any suggestions or ideas of how to treat this or what it is. He is pooping.