“…Behrman et al, 1982;Royer, 2009;Li et al, 2010) or siblings (e.g. Rosenzweig and Wolpin, 1988;Quisumbing, 1994;Loughran et al, 2008;Datar et al, 2010), and much of the focus has been on health (such as survival rates, birthweight or weight-for-age) of children in developing countries (e.g. Rosenzweig and Schultz, 1982;Rosenzweig and Wolpin, 1988;Pitt et al, 1990).…”