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.
Excellent used condition. Used with two kids, but they have outgrown it.
$75 OBO
Product information can be found here: https://www.babybjorn.com/products/baby-carriers/baby-carrier-one-air/silver-3d-mesh/