Hello Alishia and thanks for bringing such an important question to the Disney Parks Moms Panel where it's our absolute pleasure to assist you!
I'm delighted to hEar you've already made plans to visit Walt Disney World Resort this coming September with your darling little Prince & Princess who I'm quite sure are going to love every pixie dusted moment!
When my own children were but young Mouseketeers with only little legs we always utilised the convenience of
Stroller Rentals as an easy way of traversing the distances of the Disney Theme Parks and can honestly say we put our
babies in strollers and double strollers until they were around 8 years old and could cope better with the tiredness of a full Disney day.
I'm happy to share that Guests can rent both single and double strollers via
Stroller Rentals at each Disney Theme Park either per day or for length of stay or you may wish to consider rentals from any of the
Disney Featured Providers - details of which can be found included within my previous link.
Plus I also thought you may find this
Planning Guide for Pre-School Kids & Little Ones to be a super useful resource for your upcoming September visit to the magic of Walt Disney World Resort.
Have a great Disney day.
~ Jane