Child Child Care Humans child child care human Attachment-Q Sort Child, Preschool Father-Child Relations Female Hydrocortisone Infant Mother-Child Relations Mothers Object Attachment Parental Behavioral Inventory Parenting Paternal Behavior Respiratory Sinus Arrhythmia Testosterone Vagus Nerve care provider−child attachment center-based care child parent relation child temperament father child relation female hydrocortisone infant mother