Though the AAP doesn’t endorse any particular type of swaddle, it states that swaddles are safe to use as long as a baby is placed to sleep on their back, the swaddle is not too tight ...

Take the right top corner and wrap it around the baby’s back ... or side should be avoided anyway, to reduce the risk of SIDS ...

To swaddle, slip your baby's arms through the armholes, zip the sack from top to bottom, pull the non-Velcro flap across the baby's midsection and tuck it into the opposite side of the sack.