Britax offers a variety of car seats, each designed with specific weight and height limits that cater to different age groups and sizes of children. Generally, infant car seats typically accommodate children from approximately four to thirty-five pounds and up to thirty-two inches in height. For convertible car seats, the limits can vary; many models allow for use in rear-facing mode for children weighing between five and forty pounds and up to forty inches tall. When converted to forward-facing, these seats may support children weighing between twenty and seventy pounds and standing up to fifty-six inches tall. The combination seats, which mix features of both infant and convertible seats, typically have similar limits. It is essential to review the specific product details for each car seat model, as limits can differ based on the design and intended use. For the most accurate and detailed information regarding particular models, visiting the Britax website or checking the user manual will provide comprehensive guidance on weight and height limits.