Brain Health: Brain Development (Ages 0–25)

Factors contributing to early brain development

The human brain begins development before birth and continues to develop through age 25. Many factors can influence the development of the brain in both helpful and harmful ways.

Newborn gazing into their parent's eyes
Two smiling kids with heads together
Seven smiling teens posing outside

Support for the developing brain during pregnancy is important to lifelong brain health. Regular health checkups, good nutrition, and plenty of rest for the pregnant person can have a positive impact on the health of the baby's developing brain.

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Pregnant person is examined by a doctor

A sad teen sitting with arms around knees near the water

Once a child is born, the experiences they have as they grow continue to affect the development of their brains. Both adverse childhood experiences (ACEs) and positive childhood experiences (PCEs) have lasting impacts on health and behavior. This is why it is important to do everything we can to prevent and address ACEs early in life.

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Brain development is encouraged through learning new things and has been shown to be beneficial to brain health across the lifespan. Formal education is only one way to learn new things. Learning a new skill or further developing a hobby or interest, meeting new people, and going to new places are all ways to learn new things.

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Teacher reading a book to children under a tree.

A doctor giving a baby a check up

Regular health checkups are important throughout the lifespan but are critical in identifying possible brain health problems that could be fixed if recognized early in life. A variety of physical health conditions and illnesses can affect brain development.

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The overall physical health of our bodies has an impact on the health of our brains. The fuel we use to power our bodies also powers our brains, so good nutrition is important for brain development. The brain also has a vast connection of blood vessels that provide it with energy and oxygen. Good cardiovascular health through regular exercise plays a large role in brain development.

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Five children race against each other at a playground.

Two smiling children with their bicycles on a bike path.

Damage to any part of the body will have a bad effect on the ability of that body part of do what it needs to do. The brain is not different from other parts of the body. Injury will affect how well it can function. That's why injury prevention is an important part of brain health.

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Human brains continue to develop over the first 25 years of life. Use of alcohol and tobacco at any time of life, but especially during childhood and adolescence, has a negative impact on brain development as well as to brain health across the lifespan.

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The word "tobacco" on this page refers to commercial tobacco, not traditional Native American tobacco.

Two children smoking.

Glossary

 
Last revised March 26, 2026