Hi C.. I am a travel agent and have cruised with my baby! He was one went we went on our first cruise. It was a little rocky because he came onboard sick, but even at his worst, we made it through. Here are some things that I would suggest.
1. It is nice to have a balcony. Once caleb went to sleep, we were able to go out on the balcony and enjoy each other's company and we didn't have to feel like we were stuck in a dark room whispering at 8pm!
2. Don't be afraid of the ship's doctor. We traveled on Norweigan and the ship doctor was great and very attentive.
3. If you have to choose a seating for dinner, choose the early dinner. Sometimes dinners on cruises can run long. We went late a few times and Caleb fell asleep with his head right on the table.
4. Wash those hands!
5. Bring lots of swimmies!
6. Talk with your doctor about suntan lotion. We took our son on vaca at 3 months and she said it was fine, just to obviously not to leave him out in the sun for too long.
7. Talk with the cruise line about babysitting services and then Mommy and Me play times. Alot of the cruise lines that cater to little ones have all that kind of stuff.
Hope you have a wonderful trip!