This only makes sense if you know that some insurance companies are putting a "one prosthesis per lifetime" cap on their policies - and that child amputees might need a dozen prostheses before they finish physical maturation.
And just FYI, an adult amputee is going to need more than one prosthesis - probably several. They wear out, they malfunction, they break, they no longer fit for a variety of reasons.
Insurance needs to cover more than one prosthesis per lifetime.