This article presents a comparative child-focused analysis of child support policies in the UK and Australia (an influential forerunner to the development of the UK child support system). Using a child-focused approach that places the best interests of children at the centre of the inquiry, it assesses how children have fared in each country in relation to three key criteria: first, the extent to which child support policies have succeeded in addressing the issue of child poverty; second, how child support policies have influenced the degree of conflict that children can experience between their separated parents; and, third, how equitable child support policies are in relation to children in ‘first’ and ‘second’ families. By focusing solely on children's wellbeing, the article shows how competing interests and social and political pressures can influence and distort policy outcomes, perversely affecting children's lives. The article concludes that child support policies in both countries have failed in several critical areas to put children's best interests first. In response to issues and concerns raised by using a child-focused approach, key reforms to the UK child support system are proposed.