What happens to my child if he or she turns 21 before an immigrant visa is issued?
If your child is deriving status from an immigrant visa petition filed on your behalf, and he/she turns 21 before the immigrant visa is issued, a new petition must be filed in the F2B category. If your child is the beneficiary of an F2A petition in his or her own right, the F2A petition will be converted to that of F2B. In either case, your child will then be required to wait for the availability of a visa number in the F2B category before an immigrant visa petition application can be processed for him or her.