Developmental psychology Child psychology 9 Child development 7 Social psychology 5 Cognition 4 Developmental psychobiology 4 Life cycle, Human 4 Longitudinal studies 4 Adolescent psychology 3 Adulthood 3 Educational psychology 3 Methodology 3 Nature and nurture 3 Psychology 3 Animals, Infancy of 2 Brothers and sisters 2 Cognition and culture 2 Philosophy 2 Psychological aspects 2 Psychology, Comparative 2 Research 2 Sibling relations 2 Social aspects 2 Addresses, essays, lectures 1 Adjustment (Psychology) 1 Adult 1 Agent (Philosophy) 1 Aging 1 Anthropology 1 Characters and characteristics 1