Both a sleepsack and a swaddle are used to help babies feel secure and comfortable while sleeping, but they serve different purposes and have distinct designs:
Swaddle: A swaddle is a type of cloth wrap used to tightly swaddle a newborn or young infant. It involves snugly wrapping the baby's arms and torso to mimic the feeling of being in the womb. Swaddling is believed to help prevent the startle reflex in infants, promoting better sleep by making them feel secure and comforted. It can also help regulate body temperature and reduce the risk of sudden infant death syndrome (SIDS) by preventing loose blankets from covering the baby's face. Swaddles are typically used in the early months of a baby's life, usually up to around three to four months old, depending on the baby's development and preferences.
Sleepsack (or Sleep Sack): A sleepsack, on the other hand, is a wearable blanket or sleeping bag designed for infants and young children. It comes in various sizes to accommodate different age groups. The sleepsack allows the baby to have their arms free and is not meant for swaddling. It is worn over the baby's sleepwear and provides warmth and comfort while ensuring there are no loose blankets that could pose suffocation risks. Sleepsacks are often used beyond the swaddling stage and are suitable for babies who can roll over and have more control of their movements.