Hi sassychic. Welcome.
Visit Carnival's website. Scroll down to the very bottom and hit FAQ's. You will see a section for Camp Carnival. Camp Carnival has a toddler program for 2-5 year olds. You can read all about it there.
Personally, I have used C.C. for many years and have always been impressed by their attention, professionalism and safety for my child. You will not be disappointed. If anything, your children will want to spend more time in C.C. than with you. It's just that great.
Good luck. Have a great cruise. If you have any other concerns or questions, please feel free to P.M. me.