The question lands in my inbox a dozen times a year, usually two weeks before a flight. Do I need a passport for my baby? The short answer is almost always no for domestic travel and always yes for international. The longer answer involves age brackets, airline policies that contradict the federal rules, and one mistake at the passport agency that can push a trip back a month.
Here's what the 2026 rules say, what airlines actually enforce, and what I tell friends to pack anyway.
Quick Answer
For domestic US flights, no passenger under 18 is required by the TSA to present identification. That includes infants. For international flights, every US citizen needs a passport regardless of age. The wrinkle: airlines can require proof of age for lap children under 2.
Domestic Flights: The Rules by Age
The TSA's identification policy is age-based, not seat-based. Adults 18 and older must present a valid government ID at the checkpoint. REAL ID enforcement, which took effect May 7, 2025, applies only to adult IDs. Children are not part of the rule and never have been.
Newborn to 2 years (lap children)
A child under 2 can travel on a parent's lap on domestic flights, and no federal ID is required to clear security. The complication is the airline ticket. When you book a lap infant, the carrier needs to confirm the child is actually under 2, because the moment they turn 2 you owe a separate seat at the published fare.
Most major US airlines reserve the right to request proof of age at check-in or the gate. American, Delta, United, Southwest, JetBlue, and Alaska all list proof-of-age as a possible requirement in their contracts of carriage. Enforcement varies. Some gate agents ask, most don't, but the consequence of being asked and showing up empty-handed is real. I've watched parents get turned around at the jet bridge because they couldn't produce a birth certificate for a 22-month-old who looked closer to 3.
Acceptable proof of age is broader than people think: a birth certificate (photocopy fine), a passport, an immunization record showing the date of birth, or a hospital discharge summary. Check your carrier's policy in the 24 hours before you fly.
2 to 17 years
Once a child turns 2 and has their own seat, the TSA still doesn't require ID. They walk through the checkpoint on the strength of the adult ticket holder's identification and the boarding pass with the child's name on it.
Airlines still don't require ID for domestic flights for minors under 18. The proof-of-age caveat does apply to unaccompanied minor programs, which most carriers run for ages 5 through 14 with a service fee. Those programs ask for the child's full name, date of birth, and emergency contacts at booking and again at check-in. Bring a birth certificate copy if you're sending a child unaccompanied; it speeds the paperwork at the counter.
The "bring proof of age anyway" caveat
The TSA does not require ID for minors. Your airline might. The cost of carrying a photocopied birth certificate is zero. The cost of being denied boarding because a gate agent chose to enforce a policy usually ignored is the price of new flights. Carry the document.
International Flights: Passport Required at Any Age
Every US citizen needs a passport to fly internationally. There is no infant exception, no toddler exception, no "we're only going to the Bahamas for three days" exception. A two-week-old needs a passport book the same as a 40-year-old.
Closed-loop cruises are a partial exception in theory. You can sail on a birth certificate plus government-issued photo ID under the Western Hemisphere Travel Initiative if the cruise starts and ends at the same US port. Every cruise line I've checked with still recommends passports for everyone in the party, because of the cost and complexity of getting a child home from a foreign port if they miss the ship. Treat the passport as required even when the rule says optional.
For driving across the US-Canada or US-Mexico land borders, children under 16 can use a US birth certificate (original or certified copy) under WHTI. Adults need a passport book, passport card, or other WHTI-compliant document. The Trusted Traveler programs, NEXUS for Canada and SENTRI for Mexico, work for kids too and speed those crossings dramatically.
How to Apply for a Baby's Passport
This is the section parents get wrong most often. A child under 16 cannot renew by mail the way adults can. Every applicant under 16 must submit Form DS-11 in person, with both parents or legal guardians present, every time, through their 16th birthday.
Bring these in person to an acceptance facility (most post offices, some libraries and courthouses):
The child's documents:
- DS-11 application, completed but not signed (you sign in front of the agent)
- Evidence of US citizenship: a certified birth certificate with both parents' names, an original Consular Report of Birth Abroad, or a certificate of citizenship
- A photocopy of that citizenship evidence (front and back)
- One 2x2 inch passport photo taken within the last six months, eyes open, head and shoulders centered, white background
The parents' documents:
- Both parents present with valid government photo IDs
- Photocopies of both parents' IDs (front and back)
- Evidence of the parental relationship, usually covered by the child's birth certificate
The fees (as of 2026):
- Application fee: $135 (passport book), $50 (passport card), or $150 (both)
- Execution fee: $35, paid separately to the acceptance facility
The book is what you need for international flights. The passport card costs less but works only for land and sea entries from Canada, Mexico, the Caribbean, and Bermuda. It does not work for international air. If there's any chance you'll fly internationally with the child, get the book.
The both-parents rule. If both parents can't appear together, the absent parent must complete Form DS-3053 (Statement of Consent) with a notarized signature within three months of submission. Sole legal custody: bring a certified copy of the court order. Deceased other parent: bring a certified copy of the death certificate. Can't locate the other parent: file Form DS-5525, and the State Department reviews case by case. This is the most common reason a baby passport application gets rejected at the counter.
Passport photos. The child must be photographed alone, eyes open, with a plain white background. No pacifiers, no toys, no parents' hands visible holding the head. Pharmacy photo counters reject around a third of infant submissions on first try. Plan for two attempts.
Processing Time and When to Apply
As of 2026, routine processing runs six to eight weeks from the date the State Department receives the application. Expedited processing runs two to three weeks for an extra $60 fee. Both timelines include mailing in each direction, adding about two weeks on the back end unless you pay for one-to-two-day return delivery.
If you're traveling within 14 calendar days and have proof of international travel (flight booking, hotel reservation, or itinerary), you can request an in-person appointment at one of the 26 US passport agencies. These appointments are limited and book up the moment they release. Call the National Passport Information Center at 1-877-487-2778, starting at 8 a.m. Eastern on a weekday.
The single best move is to apply the week your child is born. The passport is good for five years. Spending $170 on a document a one-month-old will use exactly once before they outgrow it is still cheaper than expediting later, and you stop worrying about future trips you haven't yet booked.
Global Entry, TSA PreCheck, and CLEAR for Kids
These three programs work differently for children, and parents lose money confusing them.
TSA PreCheck. Children 17 and under can use the PreCheck lane when accompanied by a parent with PreCheck on their boarding pass. No separate enrollment, no separate fee. The parent's boarding pass needs the indicator, the kid's doesn't, and the family goes through together. This is the easiest one.
Global Entry. Children need their own membership. There is no family discount and no companion benefit. The fee, increased in October 2024, is $120 per child for five years. Each child applies separately, including the in-person interview, which can be done at most major US international airports or at a Global Entry enrollment center. Babies and toddlers are interviewed in person the same as adults, though the interview itself takes about 90 seconds.
The math: if your family flies internationally twice a year, kid Global Entry is worth it. If you fly internationally once every three years, skip it.
CLEAR Plus. Most CLEAR Plus memberships allow children 17 and under to use the CLEAR lane with the enrolled member at no additional charge. Adult family member add-ons cost extra. The benefit only matters at airports that have both CLEAR and TSA PreCheck, where CLEAR gets you to the front of the PreCheck line.
If you have a credit card that reimburses Global Entry or TSA PreCheck (Sapphire Reserve, Amex Platinum, Capital One Venture X, and several others), the reimbursement typically covers one application per cardholder every four to five years. Some cards also cover CLEAR Plus. Stack these across two parents and you can enroll the whole family without paying out of pocket.
Special Cases
Cruises from US ports. Closed-loop cruises (round trip from the same US port) technically allow children to sail on a certified birth certificate. Every cruise line I've checked recommends passports for everyone anyway. If a child needs to fly home from a foreign port for illness, missed embarkation, or family emergency, they need a passport to board the flight.
Mexico and Canada by car. Children under 16 can cross by land or sea with an original or certified copy of a US birth certificate. Adults need a passport book, passport card, or other WHTI-compliant document. Once a child turns 16, they need the same documents as an adult.
US territories. Puerto Rico, the US Virgin Islands, American Samoa, Guam, and the Northern Mariana Islands are US soil for travel purposes. No passport, same domestic-flight rules. Bring a birth certificate for a lap infant; the airline may still ask.
Connecting through a foreign country. Even if your final destination is domestic, an itinerary that routes through a foreign country requires passports for everyone in the party. A San Juan flight that connects through Toronto is an international itinerary on the Toronto leg.
What to Bring Even When Not Required
For any flight with a child under 18, my carry-on always includes:
- A photocopy of each child's birth certificate (originals stay home)
- A copy of the child's immunization record, especially for cruise travel where some itineraries require proof
- For divorced or single parents, a copy of the custody order or a notarized travel-consent letter from the non-traveling parent
- The child's passport if they have one, even on a domestic flight, because it's the cleanest single proof of age
The custody letter matters more than people expect. US Customs and Border Protection can ask traveling parents to prove they have legal authority to take the child out of the country. A notarized letter from the other parent consenting to the specific trip dates is enough. Without one, agents have turned families around. The letter takes 20 minutes to draft and notarize, and most banks will notarize for free if you bank with them.
Common Mistakes
The four I see repeatedly:
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Waiting too late. Six to eight weeks of routine processing is a real range, and peak-season applications (March through July) sit at the longer end. Apply the week the trip is booked, or sooner.
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Missing the second parent. Both parents have to appear together, or the absent parent must submit a notarized DS-3053. Showing up alone without the form is the most common reason an application gets sent home.
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Bad photos. Eyes closed, head tilted, parent's hand visible, pacifier in mouth, off-white background. The State Department rejects roughly a third of infant photos on first submission. Have a backup attempt ready.
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Assuming the card works for flying. The $65 passport card is valid for land and sea only. Parents see the lower price and book it, then discover at the airport they can't board.
What I'd Actually Do
If you're a new parent and a passport is in your future even theoretically, apply now. The book is $135, good for five years, and you avoid the panic of expediting before a trip you haven't planned. If you're purely domestic for the next five years, skip the passport and carry a photocopy of the birth certificate in your carry-on. That's it.
For the lap-infant question specifically: no, the TSA doesn't care. Yes, your airline might. Bring the document, walk to the gate, and the question of whether anyone asks for it stops being a question worth worrying about.
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