Hi Kathryn! Welcome to the Disney Parks Moms Panel!
I am thrilled to hear that you will be visiting the Walt Disney World Resort soon! My family has vacationed at "The Most Magical Place on Earth" during the month of August many times and we have always had AH-MAZ-ING
summer trips!
You should be able to add all of the Guests to your
My Disney Experience account by using the desktop version of the
Walt Disney World website. Once on the website, select "My Family & Friends" from the "My Disney Experience" drop-down menu. Scroll down past all Guests already on your account and click "Add a Guest" then "I'll enter their name and age." After you have entered in the new Guest's information, hit "Done" and your Guest should be added to your account! If you are still having issues,
give technical support a call at (407) 939-4357 or 0800 16 90 749 (UK) and the Cast Members there can help troubleshoot your problem.
Side note: since
afternoon rain is very likely in the summer, I recommend bringing along a poncho or purchasing one in the theme parks. No need for a little rain to slow down your magical adventure!
I hope this helps, Kathryn! Please let us know if you have any other questions.
Tabitha