See what documents a child needs to travel to or from the US alone or with a parent or relative. Non-US citizen children traveling to the US.If one or both parents or guardians cannot apply with their child, you will need to show us more documents. 2510 Completing Appropriate Travel Forms. Travel Policy May 2015. Passports for applicants age 15 or younger are valid for five years. This article explains the form a nonparent can use to grant an adult caregiver the authority to make decisions for a child. Ensure smooth travels with our child travel consent form notary service. This restriction does not apply to document holders of the United Kingdom or Ireland. Consent form for minors.