Developmental Life Stages
Developmental educators don’t just focus on the developmental stages in childhood; they work across the lifespan. Development doesn’t stop at a specific age - it is a lifelong process involving continuous growth, change, and adaptation. While everyone develops at different rates and has different life experiences, there are common patterns and theories that guide our understanding of typical human development and help us to understand how specific factors influence a person’s cognitive, physical and psychosocial development and lay the foundation for lifelong mental health and social capacity.
Development is most commonly divided into 8 main stages (but there are stages within the stages as well!). These stages are defined by chronological age, maturation, specific brain processes, skill attainment or life transitions (or a combination of these factors!). Developmental educators are specialised in supporting individuals with disabilities through the physical, cognitive and psychosocial life stage factors. This includes transitions between life stages, meeting developmental milestones and specialist interventions for developing skills to support quality of life across the lifespan.
Prenatal Development
The beginning of human development where the major body structures are forming and the success of development depends on the health of the mother. Influences of nature vs nurture begin, and teratogens (environmental factors during pregnancy) are considered. Evolutionary psychology and developmental psychology help us to understand how interrelated factors during the prenatal period influence development in childhood and later life stages.
Infancy and Toddlerhood
The first two and a half years of life (0 – 2:6) are an intense period of human growth and development and is often be divided into many smaller developmental periods due to the extent of growth, skill development and cognitive change. The involuntary reflexes of a newborn quickly transitions into an infant with a developing sensory system that allows them to explore the world beyond their own reach range.
Bowlby’s attachment theory becomes a major focus where the way an infant’s biological drive to form a bond with their primary caregiver for survival and safety creates a foundation for their future emotional health and social behaviour. The type of primary attachment an infant experience (secure, anxious-ambivalent, anxious-avoidant or disorganised) is a significant influencer of a child’s neurological, emotional and social development. Early relationship patterns that an infant experiences also impacts their future capacity to develop adaptive coping skills including emotional regulation, prosocial behaviours and tolerance to challenge.
Early Childhood
Also known as the ‘preschool years’ – early childhood spans from the end of toddler hood to just before aged 6 (2:7 – 5:11). During the preschool years, the right and left hemispheres of the brain’s cerebral cortex become more pronounced and brain growth, myelination, synapse formation and pruning occurs rapidly. From the outside, we see a big jump in a child’s language development, sensory-motor coordination, cognitive problem-solving skills and desire for autonomy and independence. During early childhood children will begin the development of emotional regulation skills but require ongoing co-regulation by safe and familiar adults for skills to be integrated and consolidated well.
Development during early childhood involves social cognition and the beginning of Theory of Mind, influencing how children interact socially and their understanding of the thoughts, feelings or intentions of other people. When a child experiences difficulties with conceptualising Theory of Mind, they can find it challenging to imagine the thoughts or feelings of others, recognising the consequences of behaviour or accepting things that are not realistic or factually true (like stories in picture books, animate movies, or common characters like the Easter Bunny or Santa Claus). During early childhood a child begins to develop understanding of common social rules and expectations, and will demonstrate increasingly complex forms of play including creative or pretend play, either by themselves or with peers.
Middle Childhood
Middle childhood spans from age 6 to just before aged 12 (6:0 – 11:11) and involves maturation of the brain and the consolidation of early childhood cognitive, social and physical skills. The refinement of cognitive skill assists a child to improve their attention spans, memory, problem solving skills and skill acquisition which supports them to pick up more complex academic concepts.
Significant development in peer relationships, moral reasoning, self-concept and social roles occurs and is heavily influenced by a child’s family, sibling and primary caregiver relationships. Children who experience frequent social rejection generally experience future social difficulties throughout adolescence and adulthood without early support.
Different parenting styles, such as Baumrind’s typology of parenting highlighting four prominent types of parenting including Automotive, Authoritarian, Permissive and Indifferent, heaving influence the development of a child’s social competencies, self-esteem, assertiveness, social responsibility, independence and moral understanding (right vs wrong).
Adolescence
Adolescence spans from 12 years to 18 years of age (12:0 – 18:0) and is pronounced by sexual maturation (puberty) and neurocognitive growth. The transition and changes occurring in an adolescent’s brain is more significant and impactful than the physical growth and changes that are visible on the outside of the body. Key brain developments include structural changes in the pre-frontal cortex and basal ganglia that influences behaviour such as inhibitory control (managing risks), academic cognition and problem solving. Synaptic pruning and neuroplasticity is focused on maintaining and strengthening skills that are required by the individual teenager, and influence the final physical structure of their adult brain.
The timing of puberty can significantly influence a teenagers emotional and social development, wellbeing, mental health and use of maladaptive behaviours.
During adolescence, teenagers begin to develop increasingly complex reasoning skills, use logic to support arguments and develop a moral consciousness involving global issues. The world becomes bigger than their own experiences and situation. The relationships a teenager has with their peers becomes more important and influential than their relationship with their primary caregivers, causing concepts like ‘peer pressure’ to become more frequent occurrences. Seeking social validity, belonging and acceptance by peers can drive behaviour and influences a teenager’s self-identity, self-esteem and values.
Early adulthood
Early adulthood can be considered the period from 18 years to 40 years old, but is more commonly defined by increased independence, life transitions, or specific stages such as becoming a parent. Emergent adulthood becomes early adulthood is thought to occur when a person reaches full financial, residential and emotional independence from their primary caregivers. In research, definite milestones of early adulthood are inconsistent, and the individuality of human nature makes it difficult to identify concrete behaviours that signify transition when factors such as culture and religion are considered.
Consistencies that are seen in research around early adulthood include the physical and physiological functioning of individuals peaking, self-identity continuing to be a prominent point of development and intimate relationships and work are priorities. Cortical brain growth and neuroanatomical ‘brain spurts’ occur in line with transitions to higher education, employment, impactful experiences, and new roles.
Transitions to different life roles such as a spouse, parent or formal employee can cause difficulties in adjusting social expectations, behavioural norms, self-identify and developing skills related to the successful performance of those roles. Certain transitions may be referred to with specific names, such as women transitioning to a mother, known as ‘matresence’ – signifying the intensity and life-altering impact of the transition.
Middle Adulthood
Spanning from the ages of 40 to 65, middle adulthood involves physiological aging becoming more noticeable, but cognitive efficiency can be observed such as faster problem solving. Life satisfaction is influenced by life experiences, feelings of competency, family or community connections and an individual’s adaptability to challenges or changes in responsibilities. Middle adulthood can also be known as the ‘sandwich years’, where individuals are caring for both their own children and also their aging parents. This can lead to increased awareness of morality and life goals, sometimes creating changes in behaviour which is commonly labelled a ‘mid-life crisis’ when it appears significant or out of character.
Late Adulthood
Adults aged above 65 are considered in late adulthood, a period of the lifespan that is heavily influenced by an individuals behaviours and choices at earlier life stages that impacts their physical and emotional health. Transition from a working or productive adult to a retiree can be a difficult process, with adjusted self-view and life roles. Older adults often prioritise reflection and the seeking of identity, meaning and purpose for the remainder of their life.
Neurological changes are prominent and noticeable decline in processing speed, executive functioning and neuroplasticity can influence an individual’s quality of life. Cognitive stimulation is vital, especially following retirement to retain cognitive function as long as possible.
Transition to the end of the lifespan and death can be a taboo subject. Understanding an individual’s preferences for care and support is vital to maintaining their sense of wellbeing as long as possible. Personal choice remains vital to individuals, even when services such as palliative care are required.
Why Developmental Milestones Matter
Developmental milestones provide a framework for understanding growth across the lifespan. They help caregivers, educators, counselors, and healthcare providers identify strengths, support challenges, and promote healthy development. While every individual develops at their own pace, awareness of typical milestones can guide early intervention and encourage positive outcomes.
It is important to remember that development is influenced by genetics, environment, culture, relationships, education, and life experiences. Milestones should be viewed as general guidelines rather than rigid expectations.
Human development is a dynamic and lifelong journey. Each stage of life brings unique opportunities for learning, growth, and connection. By understanding physical, cognitive, and psychosocial milestones, we can better support individuals as they navigate the challenges and achievements that shape their lives.