[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Behavioral science](https://durgical.com/en/behavioral-science/) › Human development across the life span # Human development across the life span Developmental milestones, Piaget, Erikson, attachment, adolescence, adulthood and ageing. 14 pages ## Life stage - [**Adolescence: development and the HEADSSS interview** Adolescence brings puberty, abstract thinking and the search for identity](https://durgical.com/en/behavioral-science/adolescence-development-and-the-headsss-interview/) - [**Adulthood and middle age** Adulthood brings work, partnership, parenting and caring for others](https://durgical.com/en/behavioral-science/adulthood-and-middle-age/) - [**Milestones from 1 to 3 years** Between 1 and 3 years the child walks, runs and climbs, moves from single words to short…](https://durgical.com/en/behavioral-science/milestones-from-1-to-3-years/) - [**Milestones from 4 years to school age** From 4 years the child tells stories, plays by rules, holds a pencil and gets ready for school…](https://durgical.com/en/behavioral-science/milestones-from-4-years-to-school-age/) - [**Milestones of the first year** In the first year a baby goes from lifting the head to standing, from crying to first words, and…](https://durgical.com/en/behavioral-science/milestones-of-the-first-year/) - [**Normal psychological ageing vs dementia** With age, thinking slows and recall takes longer, but knowledge and daily independence remain](https://durgical.com/en/behavioral-science/normal-psychological-ageing-vs-dementia/) ## Theory - [**Attachment: Bowlby, Ainsworth and the attachment styles** Attachment is the bond a child forms with caregivers](https://durgical.com/en/behavioral-science/attachment-bowlby-ainsworth-and-the-attachment-styles/) - [**Erikson's psychosocial stages** Erikson described eight life stages, each with a social conflict to resolve, from trust in…](https://durgical.com/en/behavioral-science/erikson-s-psychosocial-stages/) - [**Moral development (Kohlberg)** Kohlberg proposed that moral reasoning grows from avoiding punishment, to following social…](https://durgical.com/en/behavioral-science/moral-development/) - [**Piaget's stages of cognitive development** Piaget described how children think differently at each age: by acting, by symbols, by concrete…](https://durgical.com/en/behavioral-science/piaget-s-stages-of-cognitive-development/) ## Concept - [**Developmental milestones: domains, corrected age and red flags** Milestones are skills most children reach by a given age; they are tracked by domain, with…](https://durgical.com/en/behavioral-science/developmental-milestones-domains-corrected-age-and-red-flags/) - [**Language development and speech red flags** Children understand before they speak: cooing, babbling, first words near 1 year and sentences…](https://durgical.com/en/behavioral-science/language-development-and-speech-red-flags/) - [**Primitive reflexes and when they disappear** Newborns have automatic reflexes from the brainstem and spinal cord; they fade as the cortex…](https://durgical.com/en/behavioral-science/primitive-reflexes-and-when-they-disappear/) - [**Temperament** Temperament is a baby's inborn style of reacting: how active, regular, adaptable and intense it…](https://durgical.com/en/behavioral-science/temperament/) ## A to Z - [A](https://durgical.com/en/behavioral-science/a-z/a/) - [B](https://durgical.com/en/behavioral-science/a-z/b/) - [C](https://durgical.com/en/behavioral-science/a-z/c/) - [D](https://durgical.com/en/behavioral-science/a-z/d/) - [E](https://durgical.com/en/behavioral-science/a-z/e/) - [F](https://durgical.com/en/behavioral-science/a-z/f/) - [G](https://durgical.com/en/behavioral-science/a-z/g/) - [H](https://durgical.com/en/behavioral-science/a-z/h/) - [I](https://durgical.com/en/behavioral-science/a-z/i/) - [K](https://durgical.com/en/behavioral-science/a-z/k/) - [L](https://durgical.com/en/behavioral-science/a-z/l/) - [M](https://durgical.com/en/behavioral-science/a-z/m/) - [N](https://durgical.com/en/behavioral-science/a-z/n/) - [O](https://durgical.com/en/behavioral-science/a-z/o/) - [P](https://durgical.com/en/behavioral-science/a-z/p/) - [R](https://durgical.com/en/behavioral-science/a-z/r/) - [S](https://durgical.com/en/behavioral-science/a-z/s/) - [T](https://durgical.com/en/behavioral-science/a-z/t/) [← Medical psychology and behavioral science](https://durgical.com/en/behavioral-science/) Educational content on behavior and the clinical relationship; not a diagnostic or treatment guide and no substitute for assessment by a health professional. If you or someone near you is at risk, seek help now from an emergency service or a mental-health helpline. Representative model, for educational purposes only. --- Source: https://durgical.com/en/behavioral-science/areas/development/ License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/behavioral-science/areas/development/