As your baby adjusts to life on the outside or the “fourth trimester”, swaddling or cocooning them tightly mimics their previous habitat. This can provide a huge comfort not only to baby, but to parents as well knowing their child is safely swaddled, preventing wriggly arms or scratchy little fingers causing sudden wake ups. The tog (warmth rating) will help you decide which sleep bag your baby needs for which season. The higher the tog, the warmer the bag.