Royal Caribbean International said the premium package it developed around its partnership with Mattel's Barbie doll brand is now available on half of its ships, and the balance will get it by the end of May.
Barbie Experience began on Oasis and Allure of the Seas in January.
Radiance and Rhapsody of the Seas will be the last two ships to get the package, which is available on sailings of five nights or longer for $349 per child.
Monarch of the Seas is the only Royal ship not scheduled to offer it.