Cribs &/or roll away beds are available on some ships, I'm not positive about all of them so you'll have to ask whoever you book your cruise through. Enjoy!!
Sovereign of the Seas, Royal Caribbean 11-17-03
Fascination, CCL 2-14-05
Fantasy, CCL 2-05-06
Elation, CCL 9-24-06
Carnival Victory, CCL 1-28-07
Sovereign of the Seas, Royal Caribbean, 9-24-07