The most common cause of plagiocephaly (flat head syndrome) is sleep positioning. If babies spend so many hours sleeping on the back of their head, the developing bones can sometimes assume a flat shape. This can also be caused from problems with the neck muscles. Fortunately, in most cases plagiocephaly can be easy to treat with the appropriate action. Repositioning the baby during sleep to encourage them to alternate their head position or using especially designed sleep positioning devices like the Sleeping Nest or the Supreme Sleep-Sleep Wedge/Postioner is usually all that is required for the problem to correct itself.