Paediatricscommon
An 18-month-old boy is brought by his parents, who are alarmed that he bangs his head rhythmically against the cot rails for ten to fifteen minutes as he settles to sleep, most nights, and has done so for three months. He stops if they pick him up. There are no marks on his scalp. He walks well, uses about fifteen words, points to show them things, and feeds himself with a spoon. Growth centiles are unchanged and examination is normal. Which one of the following is the most appropriate response to their concern?