We asked 92 children in North West England, aged 2-17, if they were children and what it meant to be a child. Our findings show that not all children think they are a 'child'. Although different age groups defined 'childness' in different ways, children reproduced normative Western discourses of childhood, including ideas which subordinate them. The children in our study seemed unable to articulate their capabilities and contributions. We argue that children and adults need to co-produce positive definitions of childness to facilitate adult acceptance of children's participation in society and continue the struggle against adultism.