According to Carnival Cruise Lines, the child tripped and fell while running on the ship during a sea day on Wednesday, and the ship's medical staff cared for the boy until the boat docked in Port Canaveral, Florida, on Thursday.
Reportedly, Cape Canaveral Fire Rescue met Carnival Sensation when it arrived at the port on Thursday and airlifted the child to the Arnold Palmer Children's Hospital in Orlando, Florida.
A statement from Carnival said the child has been released from hospital and has returned home with his family. The line said it is providing "assistance and support" to the child and his family.
Carnival Sensation was on a four-night Bahamas cruise from Port Canaveral when the incident occurred.
--Jamey Bergman, U.K. Production Editor