Taxis generally do not have car seats however most town car companies will if you call and request them.
Here is the Florida child restraint requirement.
What is Florida's Child Restraint Law?
All children 5 years of age or younger must be properly restrained no matter where they are sitting in the vehicle. Children through age 3 must be secured in a separate carrier or a vehicle manufacturer's integrated child safety seat. For children aged 4 through 5 years, a separate carrier, an integrated child safety seat, or a safety belt may be used. (FL Statute 316.613).
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