“…A growing literature suggests that a relationship between breastfeeding and cognitive development exists (Silva, Buckfield et al 1978;Clandinin, Chappell et al 1980;Fergusson, Beautrais et al 1982;Taylor and Wadsworth 1984;Doyle, Rickards et al 1992;Wharton 1992;Makrides, Neumann et al 1994;Michaelson, Larsen et al 1994;Malloy and Berendes 1998;Quinn, O'Callaghan et al 2001;Oddy, Kendall et al 2003). In a recent critical evaluation (Drane and Logemann 2000) of the three methodological standards described by Bauchner (Bauchner, Leventhal et al 1986), definition of outcome, correct classification of infant feeding type and control of potential confounding variables were determined in relation to cognitive development.…”