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The brown adipose tissue (BAT) makes up about 5% of a newborn's body weight. Newborn babies cannot yet efficiently thermoregulate themselves because they are so young. The BAT helps a baby's body with non-shivering thermogenesis when the body falls below a certain temperature. It also serves as cushioning and protection for the body parts.

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Q: Why does a newborn mammal need such a heat source?
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