For the purposes of the Additional Learning Needs (ALN) Act, a child is defined as someone under the age of 16 and a young person is defined as someone between the ages of 16 and 25.
At ddibenion y Ddeddf Anghenion Dysgu Ychwanegol (ADY), mae plentyn wedi'i ddiffinio fel rhywun o dan 16 oed ac mae person ifanc wedi'i ddiffinio fel rhywun rhwng 16 a 25 oed.