“…Early childhood negative emotional reactivity is one such plausible outcome because of its frequently reported associations with prenatal cortisol (Bergman, Glover, Sarkar, Abbott, & O'Connor, 2010;De Weerth, Van Hees, & Buitelaar, 2003), and later psychopathology, especially internalizing symptoms in childhood (De Pauw & Mervielde, 2010;Sayal, Heron, Maughan, Rowe, & Ramchandani, 2014). Moreover, fear, a specific aspect of negative emotional reactivity, is frequently emphasized, given its potential to predict later anxiety disorders (Baker, Baibazarova, Ktistaki, Shelton, & van Goozen, 2012;Buss, 2011;Buss & McDoniel, 2016). To our knowledge, only one human study has reported a positive association between milk cortisol and aspects of infant negative emotional reactivity, especially fearfulness and sadness (Grey, Davis, Sandman, & Glynn, 2013).…”