In infants up to age 2, how does the chest circumference compare to the head?

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Multiple Choice

In infants up to age 2, how does the chest circumference compare to the head?

Explanation:
The important idea here is how body proportions change in early life. In infants, the head grows rapidly as the brain develops, so head circumference is relatively large compared with the rest of the body. The chest and trunk grow more slowly, so chest circumference stays smaller than the head during the first two years. That’s why the statement—that the chest circumference is less than the head—is the best choice. By around age two, the chest begins to catch up, but the head is still typically larger or at least not smaller than the chest in this period.

The important idea here is how body proportions change in early life. In infants, the head grows rapidly as the brain develops, so head circumference is relatively large compared with the rest of the body. The chest and trunk grow more slowly, so chest circumference stays smaller than the head during the first two years. That’s why the statement—that the chest circumference is less than the head—is the best choice. By around age two, the chest begins to catch up, but the head is still typically larger or at least not smaller than the chest in this period.

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