These are Venus figurines of the Paleolithic ("Old Stone Age") Period. Probably the first images of the Earth Mother (maybe.)

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I can't help but think this is some kind of prehistoric fetish.

7315017
There are multiple theories. Including one that these were made by pregnant women to track their pregnancies.

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Honesty, I just seen an old doll.

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Looking at it, the fact that she is rotund could represent pregnancy

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I don't think so. I'm no expert. But she looks obese to me, not heavily pregnant.

7332514
Like I said, COULD represent pregnancy, or perhaps her large belly may represent having a lot of food or the like

7332646
I don't think "represent" is the right word. It's not some abstract shape, that could represent something. It's a human body (aside from the head). And a large belly from being pregnant, looks different then large belly from bring obese.

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True