Female Humans 113 child female 113 human 113 preschool child Male 112 male 112 Child, Preschool 109 Child 97 psychology 97 child parent relation 56 adult 50 adolescent 41 Adult 40 Adolescent 39 Article 37 controlled study 33 infant 32 physiology 32 Parents 31 Parenting 30 major clinical study 30 mother 29 Infant 26 article 26 Mothers 24 longitudinal study 24 Longitudinal Studies 21 child behavior 21