I have not vetted any of this information, but I read it this week. These folks conjecture that the “manger” was likely carved out of stone as wood was scarce. I agree with other commenters that the manger was likely large enough to accommodate both mother and child. Interesting to think about nonetheless. 

https://us7.campaign-archive.com/?u=1cba1782c951dfeb5bed7062c&id=65b8a8abff

-Laura Wasielewski MS, CCC-SLP, IBCLC
Los Angeles, CA

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