I am a bit confused. Consular interview cancelled - ok. What are you waiting to get from USCIS? Also (and I am playing a guessing game here), sounds as if this is an I-601A case. If this is so, see an attorney as to how best handle this situation. With an approved I-601A, he should be out of the country very briefly for the consular interview (as opposed to regular I-601).
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Sounds like you have already consulted with at least two attorneys who know more about the situation the I do.
In general, if you cancel an appointment and re schedule it can delay the process anywhere from a month to 6 months depending on the policy of your local USCIS sub office. It is very important and I suggest you prepare to have childcare the next time or bring the child with you.
Listen to your attorney. He knows the facts of your case, we do not.
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I agree with my colleagues.
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