Well, the legal definition of "consent" is more or less defined as "a child can't make it," so I don't see how that is relevant, as we are discussing said law.

3. permission, approval, or agreement; compliance; acquiescence: He gave his consent to the marriage.
4. agreement in sentiment, opinion, a course of action, etc.: By common consent he was appointed official delegate.

consent - Definitions from Dictionary.com

Sounds about right. "Uninformed" consent might as well be permission, approval or agreement without extensive knowledge of the consequences. Sort of like eating at McDonald's without researching the contents of the food.

Unless you mean by "informed consent" to be "consenting without knowing that you consented," which I think even a child can't understand, since one can't physically answer "yes" to something unless they know a request has been made.

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