Brain development
The most complex organ in your baby's body is the brain. Although it weighs about 2-4 percent of the total body weight by adulthood, the fetus has a brain that is half the size of the body during the first few weeks of conception.
A baby's brain weighs between 300-350 grams at birth. It contains 100 billion neurons. Adequate connections are formed between the brain's integuments, primarily for survival and reflexes. Myelination of the neurons belonging to those parts is also largely done.
Rapid synapse development occurs in the newborn brain. It is called synaptogenesis. This growth is so rapid that about a trillion relationships are formed by the process. This neuronal myelination begins to occur in neurons throughout the brain. Myelination of neurons related to both hearing and vision occurs first.
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