Two days ago I found this very malnourished kitten outside my house. The poor thing was meowing its head off. It's been weened from what I can tell. It ate the dry cat food I have it when I found it. It was lively & playful up until today. It's just wanted to sleep. Every time I pick it up to put it somewhere else on my bed because I have to get up, it just lays back down without moving the slightest. It hasn't ate as of today either. It purrs when I pet it, but it seems very lethargic. I hope there isn't anything wrong with the poor baby. :(

Yes, I hope so to but it could be that she is just digesting food, maybe not eating in a long time, and body adjusting to the new more comfortable surroundings.

Anytime a kitten or cat is that lethagic you should seek immediate attention with a Vet or Emergency Pet Clinic. It soulds like he might have an infection or it could be a number of things. Put get him or her to the Vet. Also, buy some kitten formula and feed it to him with an eye dropper.
Jane