My baby painter turtles

Question
My baby painter turtle won't come out of its shell and only pops out a little bit of arm to move Wich it dose not do very much what should I do or what's wronge and what can I do to help it and  how much a day should I feed them because I have three  in the same tank please help as quickly as possible

Answer
I would have to know the environmental parameters to properly answer this question. Such as temp at basking site, on the cool side, water temp, UVB lighting etc. this link maybe of help http://voices.yahoo.com/prescription-red-eared-slider-turtle-care-5823656.html