The Nuna REVV car seat has a lower weight capacity than some convertible car seats because it has a 360-degree rotating feature that allows for easy installation and adjustment of the car seat. This feature adds weight to the overall design of the car seat and reduces the maximum weight capacity that it can safely support. The 40 lb weight capacity is the threshold for being able to move your child into a booster seat.
The weight capacity of a car seat is determined by the manufacturer after rigorous testing and evaluation to ensure that it meets safety standards and can adequately protect a child in the event of a crash. The weight limit takes into account various factors, including the materials used, the design of the car seat, and the testing requirements set by regulatory agencies.