Frankieb - I'm not an expert, but I believe gender reassignment surgery for children is pretty much unheard of. For young children (under 10), the "transition" that people speak of is simply to let the children dress and present themselves as the gender that they wish to. For adolescents, hormone therapy to (reversibly) block the progress of adolescence is controversial, but I believe becoming more common. I'm not sure when surgery really becomes an option, but I suspect that it's not on offer until young adulthood.
You guys rock!
Jenn Burleton
Executive Director
TransActive Education & Advocacy