The weight of the newborn brain increases with age and reaches the adult brain weight between six and fourteen years of life. Human beings are born with their full compliment of neurons. Synapses are formed at a very rapid rate during the early months of life achieving maximum density between six and twelve months after birth. They decrease after that due to disuse or natural attrition. The infant's brain forms and retains synapses that are frequently used.
Early experiences are thus vital to the formation and retention of synapses.
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