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The brain begins to develop during the 3rd week of gestation and the first neural cells begin dividing and differentiating into glia and neurons of the nervous system. The neural plate starts to form which is the primary foundation of the baby’s brain and spinal cord, and as it grows, it will fold on itself until it changes into a groove. As a result, the groove will turn into the neural tube, in which the fetus starts to develop its brain, spinal cord, and neurons, and once it’s formed, it begins to go to its correct locations. During the 2nd trimester, the baby’s brain stem is almost completely developed and rests above the spinal cord and below the cerebral cortex. By the time the fetus is born, the cerebellum has develop quickly and the brain’s size increases triple in weight, and resembles the adult’s brain. To conclude, this is the development of the brain that happens during the Prenatal Period.

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The brain is still developing, as the lower portions of the nervous system are well-developed while the higher regions (limbic system and cerebral cortex) are still primitive. The prefrontal cortex and cerebellum are continuing making new neurons, in which the brain is still a quarter of the size of the adult. The lower brain is in control of the newborn’s feelings and actions from the function of the brainstem and spinal cord, mainly the visual circuits. This is also the stage where some newborns can show signs of developmental disabilities such as Down syndrome. To conclude, this is the development of the brain that happens during newborns.

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The brain already has all of the neurons, and it has also doubled in size in the first year. By the third year, it will reach 80% of the adult volume in their brain. As such, there is a significant growth in the hippocampus (limbic structure) relating to recognition memory due to the infant's ability to recognize objects and people, in which the frontal and temporal lobes become consolidated. In this developmental stage, the synapses are formed quickly at a faster rate and the brain creates more synapses than they need, which the brain has twice as many synapses in adulthood. To conclude, this is the development of the brain that happens during infancy and toddlerhood.

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The brain drastically increases from 70% of its adult weight to 90% as well as a rapid growth at the front of the brain, showing an overproduction of connection and synaptic pruning which increases neural transmission’s efficiency. As a result, this shows a great increase in the development of motor behaviours between the ages, which is the beginning of motor development for individuals. In conclusion, this is the development of the brain that happens during Early Childhood.

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During childhood, the back of the brain begins the final growth spurt in which it moves from the back to the front of the brain and happens around 10-11 years old. With this, the cerebellum is developed first, and the main responsibility is to control the physical and motor coordination. As such, the unused connections in the thinking and processing are eliminated, and other connections are strengthened instead, which become more efficient for the brain. Brain development also occurs in which by the age of 8 or 9, the brain is nearly adult-sized, and the development is defined by the growth of specific structures, in which the one particular structure is the frontal lobe. As the lobes increase, children can engage in more difficult cognitive tasks. Overall, this is the development of the brain that happens during Childhood.

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During adolescence, the midbrain develops quickly which causes changes in emotional control and motivation, and as such, this causes individuals to misread others' emotions. The front of the brain, also known as the prefrontal cortex goes through a growth spurt, however, it does not become developed fully until 25 years old. As such, the front of the brain performs different functions such as focusing attention, problem-solving, organizing thoughts, and making predictions about the future, but also lacks the function of controlling risky and dangerous behaviours for adolescents. In conclusion, this is the development of the brain that happens during Adolescence.

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During the adult years, the brain becomes fully developed, however, there are some age-related changes occurring to the brain such as changes in memory, diseases/illnesses, and a decline in functions. Throughout adulthood, many of the important abilities remain the same, with little to no changes at all to the brain. In conclusion, this is a brief and basic description of the brain development that happens during Adulthood.

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During middle age adulthood, many portions of the brain begin slowing down and declining such as the Parietal Lobe and the Pituitary Gland, however, some important abilities such as decision-making and the ability to regulate emotions remain the same or have improved gradually, which shows how the brain changes over time significantly for the better and for the worse. In conclusion, this is a brief and basic description of brain development that happens during Middle Adulthood.

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In late adulthood, aging has led to a significant decline of some of the important functions of the brain, in which there is a loss of brain weight and this mostly outweighs the maintenance and improvement, mainly in the frontal cortex of the brain. Also, there is an increased risk of brain diseases such as Parkinson’s disease as the brain starts to become less efficient at knowing, understanding, and accessing knowledge, in which there is a loss of neurons and decreases in brain weight and volume. Overall, this is a brief and basic explanation of brain development that happens during Late Adulthood.