How old is too old to start helmet therapy?

The Boston Band is approved to be used between the ages of 3 to 18 months, however, the ideal range for treatment is between 3-9 months, due to the fast rate of cranial growth in that time. Helmets become less and less effective the older the infant is because the rate of growth continues to slow down and the plates of the skull begin to fuse together. When babies start treatment after 9 months old, there is still positive change, it just takes longer due to the growth rate being slower, and occasionally, the baby does not tolerate it as well. Another factor to consider is whether or not the baby is pre- or full-term. Adjusted age will affect anticipated growth.