Stages of Human Development from Birth to Adulthood

What are the stages of human development from birth to adulthood?

Stages of Human Development from Birth to Adulthood

Life is an incredible journey. We all start at a certain point but finish at a different time and place. Incredibly, the journey starts from the simple cellular beginning.

As you might already know, the union of sperm and egg cells starts human life in the mother’s womb. From then on, the human being is on its way to knowing the external world.

In this post, let us talk about the stages of human development from birth to adult.

Before reaching adulthood, a human being generally traverses three stages: Infancy, childhood, and adolescence. Let’s talk about these stages.


In the first year of the development, a baby is said to be in the infancy stage. This is the first stage of life development after birth. The infants are equipped with certain abilities that will aid them to survive. Aside from their many reflexes, their senses such as touch, hearing, and smell are already well-developed.

Babies have the ability to communicate. Crying is one of the common and most effective ways of communicating their needs.

Right after birth, an infant also develops several abilities. For instance, at six months after birth, an infant starts to create vocal sounds called babbling. They will soon develop the ability to sit on their own and crawl.

At one-year-old, infants will be able to say words. They are also capable of standing and walking.

The infancy stage is characterized by a rapid growth. At one-year-old, a baby is three times heavier and twice as long as it was at birth.


Unlike the previous stage of development, during 1 t0 3 years old, children’s development may slow a little bit. At this stage, they learn to walk on their own. More abilities are developed and learned.

At four years old, children can already run, talk through the use of sentences, and able to learn the toilet training.

By the age of 5, children are able to communicate clearly, recognize symbols such as letters and words. They can also learn how to write their names and other simple words. Most of the children at this stage spend most of their time playing with other children.

By the age of 6, children start to go to the school where their world becomes bigger. They interact with other school children and develop a socialization skill. In this stage children also learn to adapt and cope with environmental demands.


Puberty is a human stage of development wherein most of the biological and emotional development begins. At this stage, children become sexually mature. Hormones interfere the development and on the sexual responses.

During puberty, the pituitary or the master gland commands the endocrine glands to release certain kinds of hormones. Specifically, the pituitary gland sends messages to testes to release testosterone in boys. The same signals are sent to the ovaries to release estrogen.

The hormonal surges cause changes in the body that mediate or trigger specific behaviors. Aside from behavioral and emotional changes occur in puberty, children may become cautious about their actions and the way they think.


This stage immediately follows the puberty. Adolescence often considered as the transition period between puberty and early adulthood.

An adolescent may experience many mental, emotional and social challenges. In this stage, an adolescent already has the ability to think abstractly. Adolescents may know what is love, freedom, and another construct.

Adolescents may have also come across several emotional challenges. Mood swings often occur at this stage. A conflict may also occur between an adolescent and his/her parents. This is due to the pursuit of independence or autonomy in decision making.

Unlike in infancy, adolescents tend to spend more time with their peers and friends than their parents. This is the reason why adolescence is also considered the crucial period of human development.

Intimate relationship or the longing to be with somebody intimately starts. Thus, relationships often occur in this stage. Proper parental guidance is necessary for adolescence. Because they are young and inexperienced, they may commit mistakes in their decisions that might ruin their dreams or their life in general.

To learn more about the whole human stages of development, click here.

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