This guide provides you with the current Florida car seat laws, identifies all of the flaws in the law, and makes safety recommendations. Florida law states that children ages 4 through 5 must be in a separate carrier, integrated child seat, or booster seat.Under Florida's car seat laws, infants and toddlers up to age 3 must sit in separate infant car seats or a vehicle manufacturer's integrated child seat. All passengers, regardless of location in the vehicle, who are under 18 years of age must wear seat belts. Car seats for kids under 5 and under 40 pounds are required if the vehicle has seat belts. The parent is responsible for ensuring the children are in car seats. Did you know that any child under five years old must be seated in a federally approved, child car-seat? According to their rules for child safety, every child must be buckled within the proper restraint to ride in a passenger vehicle. Florida law states that children can stop using booster seats and switch to be using just a seat belt when they turn six. 1. For children aged through 3 years, such restraint device must be a separate carrier or a vehicle manufacturer's integrated child seat.