Convertible car seats are designed to accommodate children from infancy through toddlerhood. They can be used in two modes: rear-facing for younger children and forward-facing for older ones. This versatility allows parents to use the same seat as their child grows, providing safety and convenience. These seats typically feature adjustable harness systems and multiple recline positions to ensure comfort and security. Many convertible car seats also meet safety standards set by organizations like the National Highway Traffic Safety Administration (NHTSA) and come with additional safety features such as side-impact protection and energy-absorbing foam.