Welcome aboard, Stephanie!
The two girls in your group that are celebrating birthdays onboard are very lucky! I have a few suggestions to help make the cruise even more magical for them. Be sure to note that you'll be celebrating their birthday on your reservations. This is sent to Cast Members, including your dining service team, who might surprise them with a birthday song at dinner! Also, stop by Guest Services for a special birthday button for each of them.
If you want to really "wow" them as they walk into the stateroom, consider pre-ordering a
birthday celebration package. The room will be decorated just for them! Cakes are also available for order on that same form online. These can be delivered to your stateroom or presented at dinner.
Some guests also make their own custom magnets at home and decorate their stateroom doors with them. You might consider making special birthday magnets for your girls. Just grab some printable magnetic paper and go to town!
Now, since you're sailing on the Fantasy, you also could book
Bibbidi Bobbidi Boutique princess makeovers for them on their birthdays. These appointments book up fast, so be sure to log in 75 days prior to your sailing, which is when first-time cruisers are able to start making reservations. My daughter will remember her magical makeover there forever! There are also pirate makeovers on Pirate Night if your little girls are more of the swashbuckling type than the princess type!
I hope those ideas help, Stephanie! Let me know if you have further questions as you continue to plan your magical cruise!