What is the name of a thick, warm garment for a baby, shaped like a bag with sealed sleeves?

The term "Bunting Bag" refers to a thick, warm garment designed for babies that resembles a bag and often features sealed sleeves. This design serves to keep infants cozy and secure while also allowing for easy dressing and mobility. Bunting bags are typically lined with insulating materials to retain warmth, making them ideal for cold weather.

In contrast, a sleep sack is a sleeveless garment that covers the baby’s body but leaves arms free, mainly for sleeping purposes. A swaddle is a technique or garment used to snugly wrap a baby in a blanket, promoting feelings of security rather than providing the full coverage and warmth found in a bunting bag. Coveralls are typically one-piece garments for older infants and toddlers, designed for active wear rather than the specific function of keeping a baby warm in a confined, cozy manner like a bunting bag.