Prenatal Development (Conception to Birth)

• Starts at conception when the sperm fertilises the egg to form a single cell.
• The single cell divides into multiple cells, grows and eventually forms a baby.
• The process takes approximately nine months and is divided into three trimesters.
• Key stages include cell multiplication, embryonic stage, and foetal stage.
• During the embryonic stage, vital organs and primary body systems begin to form.
• The foetal stage includes significant growth and development of the organism.

Infancy and Early Childhood (Birth to 5 Years)

• This stage involves rapid physical growth and development.
• Milestones include walking, speaking and developing a sense of self, emotions, and social relationships.
• First steps in independent movement happen during this stage with key milestones of crawling, standing and walking.
• Speech development begins, ranging from cooing, babbling, first words to short sentences.

Middle Childhood (6 to 11 Years)

• Physical growth continues at a slower rate compared to early childhood.
• Developing further cognitive, emotional and social skills.
• Social interactions widen outside of the family circle, often centred around school and peers.
• Milestones include improving reading and mathematical skills, understanding more complex ideas, developing friendships, and having a more defined sense of self.

Adolescence (12 to 18 Years)

• This stage is marked by puberty where physical changes occur leading to sexual maturity.
• Higher complex cognitive tasks are possible due to continued brain development.
• Emotional and social development involves forming an identity separate from parents, understanding complex emotions and handling more mature relationships.
• Other significant elements include growing independence and starting to make life-defining choices about future careers or paths.

Early Adulthood (19 to 40 Years)

• Generally, people reach their physical peak in early adulthood.
• This phase often involves choosing a career, selecting a partner, and starting a family.
• Important milestones could include going to university, starting a job, getting married, or having children.

Middle Adulthood (41 to 60 Years)

• Typically a period of stability in relationships, career and family life.
• Some individuals may experience the "midlife crisis", reassessing their achievements and setting new goals.
• As individuals age, they may experience physical changes such as menopause or decreased strength and stamina.
• Nurturing relationships with aging parents, parenting adolescents or young adults may be key aspects of this stage.

Late Adulthood (61 Years and Over)

• Often marked by retirement, this phase may come with immense changes in lifestyle.
• Physical decline generally continues; greater risk of disease or disability.
• Includes reflection on life lived, coming to terms with mortality.
• Important social and emotional aspects include dealing with loss, maintaining social connections, living with decreased independence.