How would human anatomy differ if humans almost always had 2-4 children at a time?

Imagine that the average number of children born per birth without any artificial intervention was three (i.e. triplets were the norm) and that 98% of pregnancies gave rise to 2 to 4 children, with a single child happening only 1% of the time and more than 4 children happening 1% of the time.

This has been the case for as long as recorded history and oral traditions extent.

Otherwise, people are as they are today with today's level of technology and conditions.

If there are multiple plausible possibilities for one or more aspects of these questions, focus on the most likely ones.

Consider cultural consequences only as necessary to make plausible assumptions about the physical ones.

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How would human anatomy differ if humans almost always had 2-4 children at a time?

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