Normal
Personally I would leave it with Grandma. The reason is although you are one of the few parents that seem to care if you are obnoxious to other passengers you will eventually will be. People go on cruises to relax not hear a baby (no matter how precious) cry. The baby will not remember, would be much more comfortable at home, and you would have a much better time with your wife who probably needs a break by now. You would miss your sweet little baby and would appreciate her even more relaxed once you get home.
