You'll need to let the Child Benefit Office know if your circumstances change - for example, if the child you're getting Child Benefit for:
Is 16 or 17 and has left school and registers for work or training with the Careers or Connexions service or similar.
Is 16 to 19 and has left full-time further education or approved training earlier than the date you told the Child Benefit Office.
No longer lives with you.
You can contact the Child Benefit Office by calling their helpline on 0845 302 1444, textphone 0845 302 1474 (8.00 am to 8.00 pm seven days a week). You can also let them know about your change in circumstances online.