Im a US citizen via naturalization. My son (currently living abroad and 10 months old) was born outside of US while I was a US resident (green card holder). What's the fastest way for my son to obtain his visa and/or citizenship? Would it be possible for my son to get citizenship via derivation of me since I have recently naturalized? Or do I must file I-130 and go through the process of getting him immigration visa and green card first? Thanks!