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What is the logic behing this rule? Is it not in the best interest of a young US citizen to allow his/her mother to come to the US as soon as possible? Is there another route available for the biological parents of children who are legal US citizens?
It is indeed in the best interest of a child to leave with his parents (strike that for abusive/alcoholic/addict parents who couldn't care less about said child), but I think... (and thinking on Sunday mornings is NOt my forte) that it has to do with several things:
1.- avoiding illegal aliens to use the system based on having children on US soil (and NO, I am NOT going to start a war/rant against ilegal immigrants. I am be more compassionate than that).
2.- If you're not of legal age to drink, you're not of legal age to vote, smoke, hold a credit card; then you're not old enough to sponsor anyone.
Remember, sponsorship always has the financial string to it. Hope you can solve your case some other way
"Advise" : Check out the websites for USCIS and others, also, PM senior members who may have more info than this simple mortal.
Peace, L.