Here are the pros and cons:
RCI does offer private babysitting for those 1 year and older along with Fisher Price Aqua babies (45 minutes daily programming w/caretaker). Also, Liberty of the Seas has a small splash area for those in diapers.
Canrival offers limited group babysitting after 10 p.m. and in the mornings on port days.
NCL does not offer any of the above for those 1 year and older.
Princess allows little ones to play w/the toys in the youth room w/an adult.
And Disney Cruise has a nursery (hourly fee) for days/evenings to leave those 6 months to 3 years. Disney ships also have a splash area for those in diapers.
That said, I think Disney and RCI are best for infants.
Let me know what you decide.
Luisa Frey Gaynor
Family Cruise Editor