There are three stages of prenatal development:
1. Germinal Stage
2. Embryonic Stage
3. Fetal Stage 

Stages of Prenatal Development 

The documentary 'Life's Greatest Miracle,' produced by Nova and PBS, provides a detailed visual account of the stages of prenatal development and the process of birth.

Life's Greatest Miracle (Video Resource)

During each prenatal stage, there are many factors (e.g., genetic and environmental) that can affect one's development. These may include:
- Prenatal care
- Teratogens

Prenatal Influences

A pregnant individual is exposed to a substance known to interfere with the initial formation of major organs. Explain why this exposure would be significantly more likely to cause severe structural birth defects if it occurs during the first eight weeks of gestation compared to an exposure that occurs during the final three months of pregnancy.

Analysis of Critical Developmental Periods

Prenatal development encompasses the orderly and delicate sequence of growth from a single-cell structure to birth. This crucial period of human development is typically divided into three main stages: germinal, embryonic, and fetal.

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To study the human lifespan, developmental psychologists often segment it into distinct, age-based periods. This approach, which is similar to the structure of theories like Erikson's, allows for a focused examination of development. The primary stages include prenatal development, infancy, childhood, adolescence, and adulthood.

Age-Based Stages of Lifespan Development

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

Adolescence is the developmental stage that begins with puberty and concludes at the start of emerging adulthood, typically spanning the ages of 12 to 18. This period serves as an extended transition between childhood and adulthood and is characterized by predictable milestones across three domains: physical, cognitive, and psychosocial development.

Adolescence

Adulthood, which begins around age 20, is a major life stage characterized by significant developments across physical, cognitive, and emotional domains. This period is typically divided into three substages: early, middle, and late adulthood.

Adulthood

Psychological topics to consider from infancy to childhood include:

- Physical development
- Cognitive development 
- Attachment 
- Self-concept

Infancy to Childhood in Psychology

Emerging adulthood is a recently identified stage of lifespan development that bridges adolescence and full adulthood. Typically occurring from age 18 to the mid-20s, this period is considered a transitional phase where the primary focus is on exploring one's identity, particularly in the contexts of work and love. This stage is especially prominent in Western cultures, where the attainment of traditional adult milestones is often delayed.

Emerging Adulthood

Developmental milestones are key skills and abilities that children are expected to achieve by a certain age. For each milestone, there is an average age of achievement and a broader range of ages within which most children will reach it. These benchmarks, which include motor skills like sitting and holding one's head up, serve as guidelines for tracking a child's development against normative data.

Developmental Milestones

Prenatal Development

- Basic Trust Versus Mistrust
- Autonomy Versus Shame and Doubt
- Initiative Versus Guilt
- Industry Versus Inferiority
- Identity Versus Role Confusion
- Intimacy Versus Isolation
- Generatively Versus Stagnation
- Integrity Versus Despair

Stages in Erikson's Theory of Psychosocial Development

The concept of adolescence is a social construct, meaning it is not a universal stage of life across all societies and time periods. In pre-industrial societies, for example, individuals were typically considered adults upon reaching physical maturity. The modern idea of adolescence as an extended period between childhood and adulthood is a more recent development.

Adolescence as a Social Construct

A research team is designing a study to understand how problem-solving abilities change throughout a person's life. They decide to structure their research by observing and comparing separate groups of people from distinct age categories: childhood, adolescence, and adulthood. Critically evaluate this methodological choice. What are the main benefits of organizing the study around these discrete age-based periods, and what are the significant drawbacks or potential inaccuracies that might arise from this approach?

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