title: The first three years of life: an overview of a new frontier of psychiatry.
mesh_terms: D001828:Body Image; D002657:Child Development; D002665:Child Psychiatry; D002675:Child, Preschool; D006233:Persons with Disabilities; D004532:Ego; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D001523:Mental Disorders / Q000209:etiology; D010553:Personality Development; D011247:Pregnancy; D012649:Self Concept; D014039:Toilet Training