What is the amount of Brown Adipose Tissue (BAT) in human neonates across populations inhabiting diverse ecozones?

The Brown Adipose Tissue (BAT) plays an important thermogenic role in newborns among mammals. Thermogenesis of brown adipose tissue is triggered by the cold stimuli. It seems that the neonates with relatively more amounts of brown fat may be able to metabolise their brown adipose tissue stores to generate more heat under very cold conditions and thus have better survival chances than others.