Re: additional derivative
Why don't you call the Us embassy hotline and you can get some answers fromt he representatives there.
But don't worry, you can still bring your baby it is that you will have to process your baby's paper later.
I know one who got married before the interview and all her papers at the NVC she passed said she was single. during the interview, he told the consul of her new status and she was able to bring her husband to the US with in six months when she arrived here.
Good luck!
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