Discussion
At birth, the newborn's brain is about ______ percent of its adult weight.
Answer: A
At birth the brain is about 25 percent of its adult weight.
A newborn's brain weighs roughly 350-400 g, about a quarter of the adult brain's 1,300-1,400 g. It then grows very fast: it reaches about 75 percent of adult weight by the age of two and about 90 percent by five, which is why nutrition in the first years matters so much.
45, 65 and 85 percent are too high for birth; they are closer to the proportions reached later in infancy and early childhood.
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