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In page Adaptation to extrauterine life:

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Newborns lack the ability for thermogenesis due to an underdeveloped shivering mechanism. Body heat is lost through conduction, convection, and radiant heat.[1] Thermoregulation is achieved through several methods: the metabolism of brown fat and Kangaroo care, also known as skin-to-skin. "Brown fat" is specialized adipose tissue with a high concentration of mitochondria designed to rapidly oxidize fatty acids to generate metabolic heat.[citation needed] Skin to skin to care is the immediate placement of the neonate directly onto a caregiver's bare chest. This promotes thermoregulation of the neonate through heat generated by the caregiver.