Lap infants A child can travel as a lap infant from 3 days old until the day they turn 2 years old. There's no charge for lap infants (taxes may be due outside the U.S.) but you will be asked for proof of age. Proof of age examples include a birth certificate, passport or immunization record.

For domestic U.S. flights in 2026, JetBlue generally does not require a birth certificate for children who have their own purchased seat. However, you must bring a birth certificate (or passport/immunization record) if you are traveling with a lap infant (under age 2). This is required to prove the child's age and eligibility for free travel. While a photocopy is often accepted for domestic travel, having the original or a certified copy is safer. For unaccompanied minors (ages 5–14), while a birth certificate isn't strictly required for the flight itself, the adult dropping them off must provide a valid photo ID and complete specific paperwork. For any international travel, a valid U.S. Passport is mandatory for all children, regardless of age, and a birth certificate alone will not be sufficient to board the aircraft or clear customs.