What documents are needed when flying with a child?

What documents are needed when flying with a child?
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.
What documents do I need to fly with a baby?
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.