White matter pathways between spaced-apart regions of the cortex develop. The first years: Brain volume doubles in the first year of life as connections between neurons grow and other developmental processes unfold-including myelination, which boosts signaling speed between neurons.Major long-range signaling pathways made up of white matter begin to form several months into gestation and establish themselves by birth. The brain begins to develop its wrinkled outer surface. Rapid growth in the womb: By the last trimester of pregnancy, a fetus’s brain undergoes major increases in size, folding of the brain’s brain’s outer layer (cortex), and the development of connections between neurons.But there are some major trends in the construction and remodeling that take place: The process of brain development through childhood and into adulthood is far from straightforward, with change happening at different rates in different parts of the brain.
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