According to Article 94 of the Costa Rican Traffic Law 9078
“Persons under twelve years of age who are less than 1.45 meters tall must ride in the rear seat of the vehicle. For this purpose, there must be a suitable child restraint system, the technical specifications of which shall be defined in the regulations. Exceptionally, they may travel in the front passenger seat, using an appropriate child restraint system, when a duly accredited medical reason so requires, or when due to the constructive nature of the vehicle, it does not have rear seats.