Infant Humans 60 human 60 infant 60 female 47 Female 45 Child, Preschool 42 male 42 preschool child 42 Male 40 child parent relation 39 child 37 Child 34 psychology 32 adult 26 Adult 24 Parents 23 Article 16 Parenting 16 Surveys and Questionnaires 14 longitudinal study 14 questionnaire 14 controlled study 13 Adolescent 12 Longitudinal Studies 12 adolescent 12 newborn 12 Infant, Newborn 11 physiology 11 risk factor 11