r u my my mother?

Hi, We've had baby budgies before, that we have had our budgies breed naturallyl - however, this time, our mum died when she had two babies. We discovered them on Anzac Day, and I have been hand rearing since then. We had Ron and Hermione (my daughter loves Harry Potter) but Hermione (the older one) died after two days. Ron is still very much alive. He has got to the stage where I don't know what to do next. He is on hand rearing mix, plus baby fruit puree and egg and biscuit mix. When his mum died, I think that he was about 2 or 3 days old. He is now into full feather stage eg. down plus flight feathers, tail feathers starting to form. He is hungry all the time. I have been lucky enough to be able to take him to work with me. I'm just wondering what to do next. He (maybe) is now starting to climb, flap and jump and trying to get out of what I am housing him in. Can I have some help PLEASE? ANYONE! Taa, R U My Mum