Social exclusion at the individual level results in an individual's exclusion from meaningful participation in society. An example is the exclusion of single mothers from the welfare system prior to welfare reforms of the 1900s. The modern welfare system is based on the concept of entitlement to the basic means of being a productive member of society both as an organic function of society and as compensation for the socially useful labor provided. A single mother's contribution to society is not based on formal employment, but on the notion that provision of welfare for children is a necessary social expense. In some career contexts, caring work is devalued and motherhood is seen as a barrier to employment. Single mothers were previously marginalized in spite of their significant role in the socializing of children due to views that an individual can only contribute meaningfully to society through "gainful" employment as well as a cultural bias against unwed mothers. When the father's sole task was seen as the breadwinner, his marginalization was primarily a function of class condition. Solo fatherhood brings additional trials due to society being less accepting of males 'getting away with' not working and the general invisibility/lack of acknowledgment of single fathers in society. Acknowledgment of the needs participatory fathers may have can be found by examining the changes from the original clinical report on the father's role published by the American Academy of Pediatrics in May 2004. Eight week paternity leave is a good example of one social change. Child health care providers have an opportunity to have a greater influence on the child and family structure by supporting fathers and enhancing a father's involvement.