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Do you mean when they're born in the cold? That's because they have just come from a nice, warm environment called the womb and they are covered in amniotic fluid. Since amniotic fluid is 98% water, the water in it is going to start to evaporate. It's just like if you put out a hot cup of coffee out on a cold day, it will steam or evaporate.

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14y ago

What else can I help you with?