British researchers say swaddled babies are at risk of developing hip abnormalities. The British Medical Journal study found that a newborn's hips can become misaligned because of the way the arms are restrained and the legs stretched out.
Nine of ten infants in North America are swaddled. And the practice has been used around the world as a way to calm a crying baby and to help them sleep.
The study also warns that the long term effects of swaddling include osteoarthritis and hip replacement in middle age. The British study can be found in the Archives of Disease in Childhood.