The BABY-SAFE 5Z2 is our lightest and most innovative infant carrier yet. It features Ergo Recline, offering your baby a flatter, healthier position to make travels even more comfortable and safe. The BABY-SAFE 5Z2 accompanies your baby from birth up to 15 months and can be installed on the FLEX BASE 5Z, with the vehicle seat belt or on a variety of strollers.