On a Disney Cruise Line ship, infants under the age of two are not technically "free," but they are charged at a significantly reduced rate. Unlike some resorts where "kids under 12" might stay for free, Disney Cruise Line pricing is based on occupancy; the first two guests in a stateroom pay the full adult fare, and additional guests (including children) pay a "3rd or 4th guest" rate. For infants (ages 12 weeks to 2 years), this rate is typically about 50% of the standard child fare, and they are still subject to port taxes and fees. Occasionally, Disney offers "Kids Sail Free" promotions for children aged 12 and under when sailing as the 3rd and 4th guests in a cabin, but these are rare and usually limited to specific itineraries or slow seasons. Generally, for the best value, parents should look for these specific "Limited-Time Offers" on the Disney Cruise Line website or through a specialized travel agent to find dates where the child fare is minimized or waived.