Join Date: Jan 2002
Location: North Central Massachusetts
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Hmm. In 1978 as far as I know, the lithotomy position was used as a matter of course. This can prevent the tailbone from opening up, that is, hinging outwards, to allow passage. I do not know the situation as I was not there, and I don't think that a definitive answer can be given by anyone at this point.
When there is a c/birth for CPD (cephalopelvic disproportion), women VERY often go on to birth much larger babies.
I have, however, heard of "fixed" tailbones with the tailbone fused to the sacrum. In as much as I know, with a little "pop" the tailbone unattaches and hinges as it is meant.
Small women grow and birth babies the best of anyone. Without a lot of room to wiggle around and get stuck, babies know exactly how they can best fit through the pelvis. Think of it as an old-fashioned key in a lock. A small key does not fit as well. You wiggle it around and try to find out how it fits, but with a larger key, it automatically slides in perfectly.