Tortle original ONLY AVAILABLE : SZ S dots Place beanie on your babys head with the support roll behind babys ear. The beanie should fit snug. After 2-3 hours (or after feeding), reposition support roll behind babys other ear. Do not leave beanie on overnight when baby is unsupervised. To Treat mild to moderate Flat Head Syndrome or Head Preference: Place support roll over the flat spot. This will turn babys head to a new position and off the flattened area. To treat head preference, place support roll behind ear on favored side to gently stretch neck muscle. If not improving within 2-3 weeks, consult your physician or therapist for further assistance. Flat spots can develop from birth to 6 months of age. It is critical your baby wear a Tortle during the entire 6 months to avoid flat spots