Hi mylittlebugs, welcome to CruiseReviews!
This may be of some assistance http://www.carnival.com/cms/Images/O...y_Brochure.pdf
Carnival starts most things at 2 years of age. They do have baby sitting services available for $6/hour. The baby will not be allowed in the pool areas unless he is potty trained. Since I haven't traveled with a child that young, I really can't offer any tips.
Sure hope you have a wonderful cruise and perfect weather. Be sure to try the chocolate melting cake, at least once, it's yummy!