Anonymous:

My 8 month old does not eat table food and cant go to camp carnival.

Unless they've updated the design of the Standard Human 8-Month Old since my four went through that age, they make more mess and splotches and goo than a drunken frat boy heaving up a half keg of beer.  The ship's crew have to clean up hand prints in ketchup, chocolate and baby snot.  ...all of which are at 8-month-old height. ...which means a lot of bending and polishing.

And throwing away diapers should not cost so much!

If you noticed when you were on your cruise, diapers go in a separate trash system called "bio-hazard" -- or peligro biologicale -- because it is human waste.  This requires special sanitation techniques and equipment, more time to accomplish, and more space on board to store it all.  Yum yum.