Immigration Law Questions? Ask an Immigration Lawyer.
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Please explain exactly what you are trying to do and how long you are trying to delay the process?
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Once the visa is approved, if she is not ready or able to come to the US, then you would have to notify USCIS to see if they will delay her entry, but if not you would have to simply notify them you have changed your minds about the visa and are withdrawing the request and then you have to start the 129 process all over again when she is ready. Once she is ready you file the new I-129 and you file also proof that the child is born to a US citizen and was born abroad and you will DNA test proof the child is your child but then you file a Form N-600 for the child to obtain their citizenship documents.