The age requirement for filing for US citizenship through naturalization is 18 years. Your daughter must be 18 years at the time she files the application with USCIS. Filing the application before she turns 18 will lead to a denial and a waste of time and money. That been said, if you are lucky to have your oath ceremony completed before September when she turns 18, she may acquire citizenship automatically through you by operation of law if she qualifies.
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FAQ Source: www.Answers.Justia.com