The U.S. Government has changed the passport requirements. A valid Passport Book is required for all travelers, including children, to travel in and out of the U.S. to and from any Country, including Canada, the Caribbean Islands, or Mexico. You cannot use the Passport Card for any travel outside the U.S. except when walking or driving across a border.
If you need further information regarding passports or international travel, please visit www.travel.state.gov. This will take you to the U.S. State Department Website and provide in-depth information concerning all international travel.