“…A recent Australian study took opiate and amphetamine use among mothers into account, but not alcohol, cannabis or cocaine (McGlade et al, 2009). The most recent cohorts show a generalisation of polydrug use, which also involves pregnant women (Kashiwagi et al, 2005;Mayet et al, 2008aMayet et al, , 2008bPinto et al, 2010).…”