/kloc-children under the age of 0/8 need the consent and signature of their parents or legal guardians to apply for a US visa. When filling out the visa application form, parents or legal guardians need to sign a power of attorney to authorize their children to go to the United States and promise to take care of and support their children during their stay in the United States.

Visa is a kind of license issued by a government agency for foreigners applying for entry, exit or transit according to the provisions of domestic laws. The visa is usually attached to the passport or other international travel documents held by the applicant. Under special circumstances, valid passports or other international travel documents can be written on a separate sheet.