Is My Foreign-Born Child a US Citizen?

 Posted on September 30, 2026 in Immigration

Your foreign-born child may already be a US citizen without you ever having applied for anything. There are two ways this happens. A child can acquire U.S. citizenship automatically at birth. It can also happen later, after the child moves to the United States. The requirements for becoming a citizen vary depending on whether the child’s mother or father is a citizen and whether the child was born in or out of a marriage.

If you are trying to sort out your child’s citizenship in 2026, our Lombard, IL immigration lawyer can review the facts of your case.

How Does a Child Born Abroad Become a US Citizen at Birth?

Under  8 U.S.C. § 1401, a child born outside the United States may acquire citizenship at birth through a parent. Whether your child qualifies depends on:

• Whether one or both parents were US citizens when the child was born

• Whether the parents were married to each other at the time

• How much time the citizen parent had physically spent in the United States before the birth

When both parents are US citizens, the requirement is modest: at least one of them must have resided in the United States before the child's birth.

When one parent is a US citizen, and the other is not, the physical presence requirement depends on when the child was born. For a child born on or after November 14, 1986, the citizen parent must have been physically present in the United States for at least five years before the birth. At least two of those years must have come after the parent turned 14. This physical presence requirement measures actual time spent in the country, not whether the parent kept a US address, held a passport, or filed taxes from abroad.

Children Born to Unmarried Parents

The requirements for citizenship change when the parents are not married, and depend on which parent is the US citizen and when the child was born. When the father is the citizen, the law asks for more than physical presence; there has to be proof of a biological relationship. The father must have agreed in writing to support the child until age 18. And paternity has to have been established before the child turned 18, whether through legitimation, a court order, or a sworn acknowledgment. 

For children born on or after June 12, 2017, an unmarried US citizen mother must meet the same five-year physical presence requirement that applies when the US citizen parent is the father. For earlier births, different rules may apply.

Congress and the courts have revised these provisions several times, and the version in effect on your child's date of birth is the one that decides which rules you have to follow. A rule that applied to a child born in 1995 may not apply to a sibling born in 2005. Talk to an attorney before you assume whether a certain set of rules applies to your child; these laws are complicated and can be confusing.

How Do You Prove Your Child Is an American Citizen?

Several documents can serve as proof of a child's citizenship. Common examples include a Consular Report of Birth Abroad (CRBA), issued by a US embassy or consulate, a US passport, and a Certificate of Citizenship issued by USCIS after filing Form N-600. A CRBA is available only when the child acquired US citizenship or nationality at birth, and the application is made before age 18. 

A separate process exists for children living abroad when the US citizen parent, or in some cases a qualifying US citizen grandparent, meets the required physical presence rules. It requires the child to enter the United States for part of the process.

What Happens if Your Child Does Not Qualify for Citizenship at Birth or Through U.S. Residency?

A child who does not qualify under either of the aforementioned routes still has options. A US citizen parent can file a family petition. An unmarried child under 21 is treated as an immediate relative, which means no waiting for a visa number.

Once that child becomes a lawful permanent resident, the Child Citizenship Act conditions may then be satisfied, and citizenship can follow automatically if the child is still under 18 and living with the citizen parent. Families often reach citizenship through that two-step sequence rather than directly.

Schedule a Free Consultation With Our DuPage County, IL Immigration Attorney

For more than 40 years, Attorney Steven H. Mevorah has been serving the needs of immigrants throughout Northern Illinois. Questions about a child's citizenship often turn on dates and records going back decades. He knows what evidence actually satisfies USCIS when a parent's physical presence is difficult to document.

Contact Mevorah & Giglio Law Offices at 630-932-9100 to talk to our Lombard, IL citizenship lawyer today.