Positional plagiocephaly is a condition where a baby's head develops a flat spot due to prolonged pressure on one area. This often occurs when infants spend too much time lying on their backs, especially during sleep. The condition is generally harmless and can be corrected with simple changes in positioning. Treatment typically involves encouraging the baby to spend more time on their tummy while awake and varying their head position during sleep. In some cases, a pediatrician may recommend a special helmet to help shape the head as the baby grows. Early intervention is key to achieving the best results.