Swaddle your baby safely, comfortably, and effectively with Swaddle Strap. Easy to use, even for sleep deprived parents. Doctors and nurse-midwives recommend swaddling infants to help calm them and improve the quality and duration of sleep, but suggest that: 1) baby does not overheat and 2) baby's legs are not constricted, which could cause hip displacement as baby's hips develop. Swaddle Strap is designed with these considerations in mind. Made of soft, 100% cotton fabric with hook and loop closures, the unique two strap design of Swaddle Strap provides maximum swaddling safety. The inner strap goes under baby's arms to prevent sliding up over baby's face. The soft pillows and outer strap secure baby's arms down at the side. Perfect for any climate. Baby can be swaddled with Swaddle Strap while wearing anything, be it nothing at all to jammies or a wearable blanket. The legs free design allows you to swaddle baby while strapped into a swing and to change diaper while the baby remains swaddled. Secured arms prevent babies from scratching themselves. Works with Pavlik harness, for babies with Hip Dysplasia. The International Hip Dysplasia Institute acknowledges Swaddle Strap as a Hip Healthy product. Swaddle Strap is adjustable and comes in two sizes to fit most infants. Please use chest circumference (not age or weight) to determine the correct size. To measure baby's chest, use a soft tape measure around the widest part of baby's chest under the arms. Small fits chest 13.5" to 17" (34cm-43 cm, newborn to between approximately 3-5 months). Large fits chest 16" to 20.5" (41-52 cm, age ranges from 2 months and up). Care Instructions: Wash before first use. Close hook and loop tabs before washing. Machine wash cold with like colors. Do not bleach. Tumble dry warm, remove promptly. Do not iron.