Organ development begins during the embryonic stage. This stage, roughly from the third through the eighth week after conception, is when organogenesis occurs—the major organs and body systems start to form. You can see early heartbeats, neural tube development into the brain and spinal cord, and the beginnings of limbs and other organs during this window. Before this stage, in the germinal period, there isn’t yet organized organ formation, just rapid cell division and implantation. After the embryonic stage, in the fetal stage, the already-formed organs grow and mature rather than new organs appearing. Postnatal refers to development after birth.

Life expectancy is the average number of years a person born today is expected to live, based on current mortality patterns. It reflects the overall health and living conditions of a population. Genetics set some baseline health risks, but many factors shape how long people live: lifestyle choices such as diet, exercise, smoking, and alcohol use; access to quality healthcare and preventive services; socioeconomic status, which influences nutrition, housing, education, and stress; and the environment, including pollution and safety. Improvements in early-life health and medical care can raise the average, while disparities in any of these areas can lower it. Remember, life expectancy describes a population average and does not predict an individual’s lifespan, nor is it the maximum possible lifespan or something a person plans for themselves.

Postconventional morality centers on reasoning from internal principles and universal ethical values rather than external rewards, rules, or social expectations. When someone operates at this level, they base their choices on a personal code of ethics—principles like justice, rights, and the respect for human dignity—even if those choices conflict with laws, authority, or social norms. This reflects moving beyond what’s agreeable to the majority or what authorities demand, toward what one’s own conscience and universal considerations deem right. The other ideas fit earlier stages. Acting out of self-interest seeks personal gain or avoiding punishment. Obedience to authority relies on following orders or laws without applying one's own deeper principles. Basing actions on social norms emphasizes fitting in or conforming to what is typical in a group. A personal code of ethics stands apart because it represents internal, principle-driven decision making that can supersede external standards.

The main idea being tested is how early experiences shape trust in the world. In infancy, the key task is forming trust versus mistrust. When caregivers consistently and promptly meet an infant’s basic needs—food, comfort, warmth—the baby learns that people can be relied upon and that the world is a safe place. This leads to the virtue of hope: a basic expectation that things will generally work out because support is available. If care is inconsistent or neglectful, the infant may develop mistrust, growing up with insecurity about whether others will be there to help. This foundation then influences how they approach future relationships and challenges. The other stages listed occur later and involve growing independence (autonomy), taking initiative (initiative), and developing a sense of competence (industry), each with its own associated virtue.