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This is a free country. Reflect on that for a moment. Free. As in, do what you want, if it harms no one. Frankly, your kid being taller or not harms no one. If your kid wants to be taller, and you can safely do that, and you can pay for it (without health insurance!).. then go for it.
Yes, that may cause yet another divide between rich and poor. It is utter foolishness to try to solve that particular problem with all available "methods", however. You tackle rich/poor divides by redistributing the wealth, to quote a wise man. You do not address it by legislating/regulating/ethicizing subjects that are entirely discretionary. Forest > trees.