Cab rides within and around Disney

We are staying at AofA and will not be bringing a car seat as we will be taking the magical express to and from the airport and using the bus transportation. But if we wanted to take a cab ride to avoid long waits or for some other reason, do the cabs have car seats? We will have a 20 month old with us. Is this something we could request?

Some cabs have car seats they keep in their trunks. Others may need to make a call for a cab with a seat.