Hi, Jamie!
Thank you so much for sending us your question! When visiting the theme parks at Walt Disney World® Resort, there are
Baby Care Centers available for use which do include microwaves. These locations can be sure be lifesavers! And even though my children are older now, it's still the place I go if I need to purchase any medications while in the parks.
While there is no hard rule that the microwaves can only be used for heating food for children, if the Center is busy at the time, attending Cast Members may ask you to wait until those with small children needing to use the microwaves have gone, but you should be fine to use it for your own allergy-friendly food items. I do know guests are not able to use the refrigerators to store any items. However, you are allowed to bring a cooler into the parks and store it in the lockers available for rent at the park entrances.
I hope this helps, Jamie! Please let me know if you should have any additional questions. You can also select the highlighted link above for more details. I've also included a great Moms Panel video to help give you a better idea of what the Centers are like.
Faith