Sleep sack
Also called sleep sacks, sleepsack, sleeping sack, sleeping bag, baby sleeping bag, sleep bag, wearable blanket
A sleep sack is a baby sleeping bag with armholes, worn in bed in place of a loose blanket. HALO sells one under the trademarked name SleepSack, and parents use sleep sack for bags of any make.
How it's said
Sleep sacks are the cutest.
Do you put baby in the sleep sack awake or when they're asleep?
We are a sleep sack family.
Who says it
In the UK parents and the NHS say baby sleeping bag or sleep bag.
Where it came from
As the HALO brand tells it, its founder Bill Schmid designed America's first wearable baby blanket, the HALO SleepSack. The American Academy of Pediatrics still calls the item a wearable blanket on its parent site.
In Britain the same idea sold as the Grobag. The Gro Company was founded in 2000 by two parents who were struggling to get their baby to sleep, and Tommee Tippee owner Mayborn bought it in 2018. British health and safety pages call the item a baby sleeping bag.