Universal Credit can contain a Child Element if you are responsible for a child/children. In addition to this where applicable a disabled/severely disabled child element if the child/children you have responsibility for have certain disability benefits.
Universal Credit helpline
Telephone: 0800 328 5644
Textphone: 0800 328 1344
British Sign Language(BSL) users: Video relay service
Relay UK (if you cannot hear or speak on the phone): 18001 then 0800 328 5644