Well - I'm not sure what you are housing it in now, for that size a 10 gallon should work for a while - make sure your basking temps are good - 100-105 for a baby should be fine - You can bump that up just a few as it gets bigger - make sure it has a cool side to retreat to as well - and a good uva/uvb bulb is neccessarily as well - Once that is set up correctly, and he's settled in - he should be eating - I would offer both veggies and dusted insects daily to get him eating and get some weight on him - Good luck