Ugh...Baby pigeon...HELP!

[horseluv29]

Ok, my son found a baby pigeon, fallen out of nest i assume. I'm not sure how old, but we decided to raise it. (There is'nt anyone who will take it here.)
When I was younger i remember my dad and I taking care of some babies, but that was years ago. I need help. I know about feeding it, keeping it warm, housing, etc., but here are my concerns...

1) At what age do I change its feeding from baby food to adult food. It does have some feathers on its wings, developing them around its head and breast area and still has down on its back.

2) I am keeping it in a box with straw under a heating lamp. When should this little guy be moved to a larger cage and what type. My son built a cage for when its an adult, but I'm clueless on how and when they become independent.

Those are my two main concerns, I'm sure I will have more questions as the baby grows. It has definately adopted me as its mommy (so cute). But this mommy needs help.

Thank you to anyone who can help us out.