They say parents should always put infants on their backs to sleep - in a crib with a firm mattress, with no soft objects around them. (articles.chicagotribune.com)
It is designed to help you carry one infant on your back while the other rides up on your chest as long as they are between 10 and 35 pounds. (babycarrierreviewguide.com)
«Back - to - Sleep» first promoted the idea of placing infants on their backs to sleep in 1994. (Baby-Place.com)