The size of the human brain does not change across the lifespan; the size of one's brain at birth is the size that his or her brain will be as an adult.

Name: The size of the human brain does not change across the lifespan; the size of one's brain at birth is the size that his or her brain will be as an adult.
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Question

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At birth, the human brain weighs about 25% of its adult weight. By age 1, it has grown to about 70% of its adult weight; by age 3, the brain has grown to 90% of its adult weight.

The Size of the Human Brain Does Not Change Across