A.) Children do not need an I.D. to travel within the United States.  However, the  child may be asked to prove his/her age; therefore it is a good idea to carry an I.D., such as a school I.D., driver’s permit, driver’s license, or birth certificate if your child looks like he or she may be at least 18 years old.

For lap children who are under 24 months of age, you may also be asked for proof of age to confirm that the child is less than 24 months; therefore you should carry the child’s birth certificate.

Children of all age must present a valid U.S. passport to fly out or in to the United States.  Some countries require that the passport be valid for at least 3-6 months beyond the return travel date.