This is from the myfl site.. I hope it helps you.. it is a little confusing when you read it though...because it does state "seat belt".
http://www.dot.state.fl.us/Safety/HighwaySafetyGrantProgram/hsgp/HSGPareas_OccupantFAQ.htm#Florida's%20Child
1. Can a passenger in a motor vehicle be ticketed for not wearing a safety belt?
Yes. All front seat occupants must buckle up, regardless of age. Passengers under the age of 18 must be belted in either the front or back seat of the vehicle. (FL Statute 316.614).
2. What is the fine for a safety belt violation?
Penalty for violation is $30.00 plus other legal assessments.
3. Can a car seat be used on an airplane?
Most infant, convertible, and forward-facing seats are certified to be used on airplanes. Booster seats and travel vests are not. You should check the label on the seat and call the airline before you travel to be sure your seat meets current Federal Aviation Administration regulations.
4. 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).
5. What is the fine for a child restraint violation?
Penalty for violation is $60 and 3 points.
6. If the safety belt does not fit my child correctly should the shoulder belt be placed under the child's arm for a better fit?
Never put the shoulder belt under a child's arm or behind the back, as this increases the risk of severe injury in a crash. Use a booster seat to correctly position the lap and shoulder belts for children once they outgrow forward facing child safety seats at about 40 pounds and around 4 years old. Children from approximately 40-80 pounds and 4'9" should ride in a belt positioning booster seat.