Know what documents a child needs to travel to or from the U.S. All children, including infants, must have their own travel documents. 1. Fill Out Form DS-11 and Print It 2.Get Evidence of US Citizenship (and a photocopy) 3. A travel consent form is a legal document that gives a parent or legal guardian permission to travel with a child outside of the United States. They will have a form with the required information. All children under age 16 must apply for a passport in person with two parents or guardians using Form DS-11. A child travel consent form allows a minor to travel alone or with another person or group.