[quote=@catchamber]
<Snipped quote by Penny>
How can anyone objectively claim that tailoring a child to potentially be taller than their peers is ethical, while they claim that tailoring a child to practically be a smurf is unethical? Aren't ethics fundamentally subjective, as they're based on culture?
[/quote]

Ethics are subjective of course but that dosen't preclude the existence of ethical arguments for or against something within the norms of society. For example is engineering a child to have a higher likelyhood of Parkinson's disease medical malpractice, or child abuse, or both.