The law in Spain requires that a baby or young child be secured with a child safety seat when being transported in the car. If you do not wish to bring your own child safety seat, then ask the attendant at the taxi rank to find you a taxi with a child safety seat.

Legally, children under 135 cm (approx. 4'5") are required to use an approved child restraint system (CRS) in all vehicles in Spain, including taxis. However, there is a practical "urban exception": taxis in Barcelona are technically allowed to transport children without a car seat only within the city limits (urban areas) if they are in the rear seat. That said, this is strongly discouraged for safety reasons, and for any travel on highways or outside the city (including the trip to/from the airport), a car seat is mandatory. Most standard taxis you hail on the street do not carry car seats. If you want to ensure your child's safety, you should book a taxi in advance through a service like "Taxi Bambino" or "Big Taxi Barcelona," which specifically offer vehicles equipped with infant seats, toddler seats, or boosters. In 2026, many families also use portable travel vests or inflatable boosters (like BubbleBum) to ensure they are compliant and safe without needing the driver to provide the equipment.