“…Second, in some studies investigating the effect of the babyface schema, neutral infant face images were mainly used as the experimental materials (Brosch et al, 2007; Cheng et al, 2015; Franklin et al, 2018; Glocker, Langleben, Ruparel, Loughead, Gur, & Sachser, 2009; Glocker, Langleben, Ruparel, Loughead, Valdez, et al, 2009; Hahn et al, 2013; Jia, Cheng, et al, 2019; Parsons et al, 2013; Parsons, Young, Kumari, et al, 2011), which greatly limited the external validity of such studies. In fact, when an adult interacts with an infant, the facial expression of the infant is an important cue for the adult to judge the infant’s physical and mental states (Sullivan, 2014).…”