Crafted in cool, comfortable mesh, this carrier offers sturdy support, multiple carrying positions and many adjustable features. 0–3 years 8–33 lbs, 21–39 in Four carrying positions Ergonomic design Baby Carrier One Air has four carrying positions: newborn, facing in, facing out, and on your back. You can carry in the facing-out position from around the age of five months, once your baby is strong enough to hold their head up unaided. You can carry your baby on your back from the age of 1.