It’s a combination of fat and loose skin. They have a lot of growing to do and store a lot of calories.
Human babies have the highest percentage of body fat at birth compared to all other land mammals, peaking around 25% at 9 months.
The closest other mammals are seals and guinea pigs.
A lot of the fat mammals put on weight quickly but aren’t born as fat as humans.
The fat insulates as well as providing energy for a power hungry brain.
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