Hi there, Marcela!
Thanks so much for stopping by the Disney Parks Moms Panel with your great questions. I'm so sorry to hear about your child's injury, but a trip to the Disneyland Resort might be the perfect way to help them feel better!
You can find information on acceptable stroller dimensions and anything else that isn't permitted at the Disneyland Resort on the
Park Rules page. Strollers cannot be larger than 31" in width and 52" in length from their longest points. I also have a four year old child, and he is perfectly happy in a fairly small and inexpensive umbrella-type stroller with a canopy. We actually just returned from a Disney vacation where he still very much needed time to rest in his stroller and even took some daytime naps in it. You will be able to find stroller parking outside all attractions and Table Service restaurants for your convenience. Know that you can also
rent a stroller directly from the parks on a daily basis as well!
Your child shouldn't have any issues riding attractions at the Disneyland Resort with a hand injury. It will be completely up to you and your doctor's discretion if you choose to ride. Plus there are so many other experiences apart from just attractions that your child will enjoy like
entertainment, shows, Character meetings, and nighttime spectaculars! My son loves the Disney Junior Dance Party! and dancing to live music throughout the parks.
I hope this helps, and please return if you have any other questions. Have a magical day!
-Jennifer