You'll be able to get Child Benefit if you're bringing up:
A child aged under 16.
A young person under 19 (under 20 in some cases) who is either studying in full-time, non-advanced education (A-level or equivalent) or on an approved training programme.
A 16 or 17 year old who recently left school or training and registered for work or training with the Careers or Connexions Service or similar.