What is the best way to keep your hands free wile carrying around your baby? The 4 in 1 Convertible Baby Carrier is designed for babies 0-30 months old. It is made from durable hypoallergenic materials and has a breathable mesh to keep you and your baby cool. As your baby grows you can convert your carrier to 4 different carrying positions. The 4 in 1 Convertible Baby Carrier is very easy to use and very comfortable for you and your baby.