Ahoy, Yvonne!
Thanks for cruising by the Disney Parks Moms Panel with your question - I'm happy to help!
All types of milk - whole, reduced fat, skim, and my daughter's favorite - chocolate milk, are readily available onboard. Whole milk can be found at the 24-hour beverage station on the Pool Deck, so you'll be able to grab it whenever needed for your little one! Low-fat, skim and chocolate milk are offered at the buffet restaurants, in the cereal section.
Complimentary Room Service is available 24 hours a day, so you can also order milk to be delivered to your stateroom any time you'd like! You'll have a small mini-fridge in your stateroom where you can store beverages. It's not quite as cold as a typical refrigerator, so if you'd like to request an ice bucket, you can do that through Room Service or speak to your Stateroom Host or Hostess. While Room Service is included in the cost of your cruise, tips for the service are not. We usually keep an envelope with small bills on hand for gratuity.
If you'd like milk with your dinner, simply ask your server and they can bring a glass to your table. They're also happy to provide you with a to-go cup as well!
No worries, your little one won't need a "Dairy Godmother" on your Disney Cruise Line vacation! I hope this helps with your planning. Have a magical day! - Diane W.