Sociological theory displays a tendency to depict the social world in
terms of completed 'beings'. The social, thus depicted, is a world of
powers to 'finish' (such as the power granted to convention to provide
for social order), and finished products (such as agents and ethical
points-of-view). As sociologists of childhood have attempted to bring
children into sociological focus in their own right, the disciplinary
concern with the 'complete' has required that children be attributed t
he properties assumed more normally to belong to adults. The sociology
of childhood has thus preserved the privilege of the complete and the
mature over the incomplete and the immature. In this paper the key so
ciological issues of convention, agency and ethics are given a theoret
ical interpretation that makes them fit for understanding childhood. T
he ability of convention to complete social order is questioned. Agenc
y is portrayed as the emergent property of networks of dependency rath
er than the possession of individuals. An alternative to the ethics of
'positions' is offered in the form of an ethics of 'motion'. Where ex
tant sociologies of childhood have brought children into the 'finished
' world of sociological theory, this paper uses childhood's ontologica
l ambiguity to open the door onto an unfinished social world.