There is no need to have a passport or passport card when taking a closed-loop cruise that departs and returns to the same U.S. port. However, proof of identification is required to take the cruise. Types of acceptable identification include a government-issued photo ID, birth certificate or certificate of naturalization. A U.S. passport or passport card is required for all travelers, regardless of age, taking a cruise that stops at foreign ports of call.
Proof of identification is required to enter Canada when traveling by land in a car, on foot or aboard a train. However, a valid U.S. passport, passport card or enhanced driver's license may be required for re-entry into the U.S. Those younger than 16 only need to present a birth certificate, certificate of naturalization or consular report of birth abroad to travel between the U.S. and Canada.
Mexico has set up what is known as "border zones," where a valid form of ID for a minor is acceptable for traveling. Since March 2010, a valid U.S. passport or passport card is required for all travelers, regardless of age, who wish to travel past these zones. These zones are approximately 30 kilometers past the U.S.-Mexico border.
Children younger than 16 must appear in person with both parents when applying for a passport. Parents must be able to provide proof of identification and evidence of relationship with the child. Proof of identification can be a passport, military ID card or driver's license; proof of relationship with the child can be a copy of her birth certificate or adoption papers. If only one parent can appear in person, a notarized form signed by the other parent is required to be submitted with the passport.
