Hi Sara! Welcome back to the Disney Parks Moms Panel!
I hope you are having a wonderful time on your Walt Disney World Resort vacation already! If I could choose where I would most want to spend this week, I would definitely pick "The Most Magical Place on Earth" for my choice!
I did a little research on the
Disney Featured Providers websites for strollers and did not see any offering car seats, but you may want to call and see if they have any available to rent. Their phone numbers can be found at the link I provided above. Even if they don't, they may be able to suggest a reputable company that does. I also did a quick internet search for "car seat rentals Orlando" and found that there are a few rental companies in the Orlando, FL area that offer car seat rentals (and they were relatively inexpensive!), but I haven't personally used those companies, so I definitely recommend you check out their reviews prior to renting from them.
If you are just planning to use a ride-sharing service to get around the Walt Disney World Resort and that is why you need a car seat, I suggest using
Minnie Van Service. Each Minnie Van has two car seats and their use is included in the price of your ride! If you are planning to
rent a car, most rental companies offer car seat rental as well, so you may want to check with the company.
I hope this helps, Sara! Please let us know if you have any other questions.
Tabitha