Researchers examined the deaths of 47 young children under the age of 2, all of which occurred while in a device made for sitting or carrying. Two-thirds of the deaths occurred in car seats, while the rest occurred in slings, swings, bouncers, and strollers.

Asphyxiation (positional or strangulation) was the cause of death in 46 cases; 52 percent of the deaths were caused by strangulation from the device's straps.

Related: How Safe Is Your Baby's Sleep?

Sleep-related deaths are the number one cause of death in kids between 1 and 12 months old. To avoid injury or death, experts urge parents to never, under any circumstance, leave infants and young children unsupervised—sleeping or awake—while in these devices. They also advise that car seats should only be placed on a firm, stable surface and any buckles should be fastened correctly.

The best place for your baby to sleep is on her back, in a crib that has a firm mattress and is free from any loose bedding. To be sure your baby's sleep environment is as safe as can be, check out the American Academy of Pediatrics' Safe sleep guidelines.