Does Your Child Automatically Become a U.S. Citizen When You Naturalize? A Guide to Derivative Citizenship

When a parent naturalizes as a U.S. citizen, their minor child may automatically acquire U.S. citizenship at the same moment—no separate naturalization required. This is known as derivative citizenship, governed by the Child Citizenship Act of 2000. But "automatic" doesn't mean "hands-off." You still need to verify eligibility and obtain official documentation.

Who Qualifies for Derivative Citizenship?

A child acquires citizenship automatically if all three of the following conditions are met at the same time:

• The child is under 18 years old at the time the parent naturalizes
• At least one parent is a U.S. citizen (by birth or naturalization)
• The child is a lawful permanent resident (green card holder) residing in the U.S.

The moment a parent takes the Oath of Allegiance, a qualifying child becomes a U.S. citizen by operation of law. If your child lives abroad or doesn't yet have a green card, a different process applies—Form N-600K is used for children residing outside the United States.

Getting Official Proof: Form N-600

Even though citizenship is automatic, you'll need documented proof for passports, school enrollment, employment, and more. File Form N-600 (Application for Certificate of Citizenship) with USCIS to receive an official Certificate of Citizenship.

• Filing fee: $1,170 (as of 2024)
• Key documents: Parent's naturalization certificate (N-550) or U.S. passport, child's green card, child's birth certificate (with Apostille and certified English translation), and proof of parent-child relationship
• Processing time: Roughly 12–18 months, depending on USCIS workload
• Faster option: While waiting on N-600, you can apply directly for a U.S. passport for your child at a passport acceptance facility. A U.S. passport serves as valid proof of citizenship in the meantime.

If your child's birth certificate was issued in Korea, it must be apostilled and accompanied by a certified English translation before submission. Korean-speaking immigration document translation services are widely available in cities like Los Angeles, New York, and Chicago.

Derivative citizenship rules can get complicated depending on your family's specific circumstances—divorce, adoption, stepparent situations, or children born abroad can all affect eligibility. We strongly recommend consulting a qualified immigration attorney to assess your individual case before taking action.