I am a student in uk and my wife is my dependent. We are living together and our Visa expires on jan 2012. Now?

i am a student in uk and my wife is my dependent. We are living together and our Visa expires on jan 2012. Now we are expecting a baby in december.Plese let me know any benefit could we have when the baby born in UK and procrdures get the visa and passport to our newborn baby