In this case, defendant pleaded guilty to twelve counts of production of child pornography and one count of transportation of child pornography and was given a 960-month sentence. The judgment is affirmed, where: 1) the district court erred when it incorrectly applied an upward sentencing adjustment for a "vulnerable victim" pursuant to U.S.S.G. section 3A1.1(b)(1) based upon one of the victims' age-related cognitive development and psychological vulnerability, factors that already were incorporated into an upward adjustment for the young age of the victims pursuant to sections 2G2.1(b)(1) and 2G2.2(b)(2); but 2) the error is harmless.