The phrase identifies the optimal safety devices designed for simultaneously transporting two infants or young children in a vehicle. These products are engineered to meet stringent safety standards while accommodating the specific spatial requirements and developmental stages of multiple young occupants. Examples include infant car seats suitable from birth, convertible car seats that adapt as children grow, and all-in-one models intended for extended use.
Selecting appropriate devices provides critical protection in the event of a collision, minimizing the risk of injury to vulnerable passengers. Historically, the evolution of these devices reflects advancements in materials science, biomechanics, and regulatory requirements aimed at continuously improving child passenger safety. The importance is underscored by the legal mandates in many jurisdictions requiring the use of such restraints and the documented reduction in child fatalities and injuries attributed to their proper implementation.
