Can i donate stem cells to cure my child?

Possibly: This is too complicated a question to answer here. I would suggest discussing this with your child's physician.

Banking stem cells: There is some controversy regarding this topic currently. The viability of banked stem cells is not great for one. However, the real issue is that while you can bank your cells, according to current fda guidelines, you can't use them on yourself, and certainly not on someone else. Hopefully this will someday change.