Hello Dorothy!
You ask a VERY IMPORTANT question!! With five kids of my own, the question of strollers is always on my mind as well!
From my experience, I have actually found the best stroller for my small children has been the Sit and Stand stroller. It allows my three year old to stand up while I push him, and he can sit down when he gets tired. Now, with your age range, I would recommend the Sit and Stand stroller
and an umbrella stroller. That way all three kids will have a place to sit and rest. Another great thing about the umbrella stroller is that it is lighter and easier to get on and off the bus transportation system. NOTE: The Sit and Stand strollers are quite heavy; however, the benefits far outweigh the challenges!
You can also rent strollers at all of the Disney Theme Parks, Water Parks, and Downtown Disney! To find more information about stroller rental, click
HERE!
Hope this helps in your planning. If you have other questions, please let me know!
Have a MAGICAL day!