What to give a baby if they get sea sick on a cruise?

lopku asked:

I am about to go on a cruise and want to be prepared if my baby gets sea sick. I know most people do not get sick on cruise ships, but would like to be prepared. What is safe to give a baby or what to do?
He is 13 months old also.
I would of course ask and research before giving something to my child! I am just curious for right now.