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I am still to get my passport stamped. But to answer your question,
Yes you may take youe child for stamping process doesn\'t matter he belongs to which nationality. They do not discriminate on the nationality of a citizen. Also it is a boon, if they see you with a child they may ask you to go to the front of the line and your work may be completed early. Only carry all the relevant documents/papers/photographs etc along with EAD/AP/I94 etc.
Good luck
Brahma