Camp Carnival hours on Sea Days are 9AM-10PM
Port Days hours are 15minutes prior to whatever the earliest shore excursion starts-to approximately 2PM for supervised freeplay. Then 2-10PM for scheduled activities. Baby sitting for a charge from 10PM-3AM
Child ages 2-5 must be signed in/out by the same person. Children will always wear a muster station bracelet. It is expected you will pick up the child for dinner. 100's of thousands of child sail on Carnival every year. I don't think you have to be too overly concerned about their safety.