“…Despite the practicality of saliva sampling in older children (Clements, 1996;Gunnar & Donzella, 2002), adults (Broderick et al, 2004;Clements, 2000), and even very young infants (Grauer, 1991), stress-free saliva collection from toddlers has proven to be quite problematic (Talge, Donzella, Kryzer, Gierens, & Gunnar, 2005). However, the benefit of early developmental research using cortisol has been well supported (see Gunnar, 2003).…”