What documents do I need to fly with my infant? If you're traveling internationally, your baby will need a passport regardless of their age. For domestic travel, it's a good idea to bring a copy of your child's birth certificate in case you need to verify their age and/or your parental status.

For a 3-month-old infant to fly in 2026, the required documents depend on your destination. For domestic flights within the US, an infant generally does not require a photo ID. However, most airlines (like Southwest or Delta) require you to provide a certified copy of the birth certificate to verify the child is under two years old (especially if traveling as a "lap child"). Some airlines also accept a hospital-issued birth record for very young infants. For international flights, the rules are much stricter: every infant must have their own valid passport. Obtaining a passport for a 3-month-old requires both parents to appear in person at a passport agency with the baby. Additionally, if only one parent is traveling with the infant internationally, many countries require a notarized Letter of Consent from the non-traveling parent to prevent international parental child abduction. Lastly, you should always carry the baby’s immunization records, as some countries may require proof of specific vaccinations (like Polio or Yellow Fever) depending on where you are arriving from or transiting through.