Assuming that a newborn infant is developing favorably, his brain will be about one-fourth the size of an adult human brain and will weigh about one pound or less.

Name: Assuming that a newborn infant is developing favorably, his brain will be about one-fourth the size of an adult human brain and will weigh about one pound or less.
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Quizplus · Accepted Answer

This is true. The average adult human brain weighs about 3 pounds, while a newborn's brain is about one-fourth the size and weight, weighing in at around 1 pound or less.

Assuming That a Newborn Infant Is Developing Favorably, His Brain