The current priority date for minor children of permanent residents is June 2011, which means that the USCIS only now processes those petitions that were filed back then. Thus, the wait time is approximately two years. If you become a U.S. citizen, the immigrant visa will be immediately available to your child, so USCIS can be notified. But even so, it takes approximately a year, give or take, to process immigrant petition, and given that the child is a minor, the second parent would have to consent to the child's departure and sign the appropriate documents. Either way, it takes time and you need to be patient.
Answered on May 22nd, 2013 at 8:09 PM