lucky my spider ball python

Yes. They should be round. Maybe post some more pictures.

http://i42.tinypic.com/vosfmc.jpg

well here's 1 out of the cage

I just bought a 3 week old hatchling that's very thin as well,hope he isn't a trouble feeder..going to feed him this koan...fuzzies for now and for a few weeks til he takes it good then I'll go to hoppers.

feed ya guy two times a week or every 4-5 days..he does look a bit thin

My suggestion would be to try and switch to rats as soon as you can. Do you feed frozen/thawed or live?
I have 5 week old hatchlings on rat pups right now and I feel like they could be taking bigger...but each snake is different and they're not all the same size when they come out of the egg.
Good luck w/ur spider! it's a good looking one

updated pics of lucky

http://i60.tinypic.com/hwa5ub.jpg

http://i57.tinypic.com/15qygiu.jpg

http://i57.tinypic.com/1zm0dv5.jpg