Repositioning is recommended for all newborns; every baby is at risk for developing Flat Head Syndrome, plagiocephaly or torticollis. Because babys skulls are soft, yet heavy and necks are weak, infants are vulnerable to developing these conditions in the first few months of life. This is why, proper movement and deliberate repositioning of your infant from birth is one of the keys to the healthy development of your baby. Tortle is a simple, comfortable beanie that is FDA cleared to help prevent and treat Flat Head Syndrome (plagiocephaly and torticollis). Early detection and correct use of Tortle will ensure the best long term results. To properly use the Tortle, you must pull the beanie down as far as possible so the crown of the head is fitted into the top of beanie and ears are covered. If beanie is covering babys eyebrows, you can fold the front of the beanie. Remember to let your Tortle grow with your baby and purchase the next Tortle size!Tortle helps to prevent and treat flat head syndrome. It does this by gently deflecting your babys head when shes sitting or lying on the back of her head, to gently move her head from side to side. Its a natural way to encourage healthy head and neck motion, without any of the suffocation risks of repositioning pillows or wedges. Sizes: Small (0-2 months/5-10 lbs.) Medium (2-4 months/10-15 lbs.) Large (4-6 months/15-20 lbs.) 95% cotton/5% spandex Machine Washable It is recommended that all newborns wear a TortleTM for the first six months of life to aid in repositioning babys head..