The Fifth Circuit has determined that the Child Citizenship Act does not convey derivative citizenship on the child of a citizen who was interview for his permanent residence before his 18th birthday, but whose application for residence was not approved until after his birthday. The Court declined to estop the Government from denying the applicant's citizenship claim even though there was a four-year delay in approving his application.
The full text of Gutirrez v. Lynch can be found here:
http://www.ca5.uscourts.gov/opinions/pub/14/14-60693-CV0.pdf