Children under 18 don't need an ID to fly domestically but do need a passport for international flights. You can also bring breast milk or formula through security, even if your child isn't with you.
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Age: 0 to 2 Years OldUnless your child already has a passport that can be used to prove their birth date, you may need to bring a copy of their birth certificate. While some airlines are more lenient than others, it's always best to come prepared.
Children under the age of 16 do not need to show identification when travelling on domestic flights. The adult they are travelling with must travel with photographic identification and be able to confirm their identity.
Friends or acquaintances may tell you that age verification is not required for your lap child, but that is absolutely not true. While children don't need an ID for TSA, to fly as a lap infant and document to the airline that they are indeed under 2 years old, you need to be prepared.
Diaper bags, soft-sided cooler bags with breast milk, child safety seats, strollers and medical or mobility devices don't count toward your personal item or carry-on.
Each airline will have its rules about who can sit where, but a bulkhead seat is generally considered an excellent option for families traveling with young children. The bulkhead is at the front of the cabin and sitting in those seats usually guarantees you some extra leg room.
To prove your child's age to an airline, one of the following documents will suffice: Child's passport (how to get a U.S. passport for an infant and things to know about children's passports) Child's birth certificate. Child's immunization form or other medical records may also work domestically.