infant human 395 Humans 341 female 315 Infant 306 male 274 child 244 Female 234 preschool child 204 Male 200 Child, Preschool 189 Child 173 adult 148 Article 145 adolescent 125 controlled study 118 newborn 113 Adult 103 Adolescent 101 major clinical study 94 article 91 Infant, Newborn 90 young adult 69 Young Adult 62 human experiment 59 procedures 54 psychology 54 clinical article 50 child parent relation 49 physiology 49