There are lockers, but honestly, that’s a hassle and the better option is to plan not to do this, especially if the car seat is too large to fit in one. There are Uber options with car seats (although they can be tricky at high priority times). This is why we always just rent a car when staying offsite.
You may also find that the cost of renting a car from the airport for your trip is not that much more than the cost of Ubers + tips for the length of your trip.
This is a link to park locker sizes and costs, otherwise you’re hauling it around with you all day long.
Agree with PPs, this is a bad idea. Rent a car or switch to a hotel that has a park shuttle. You are not going to have the savings you thought so you need to re-math your trip anyway.
OP are you staying onsite?
Minnie Vans only run on property.
If you are staying in a Disney resort then why not just use Disney's free transportation to the parks?
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