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In page Antevorta:

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Antevorta and Postvorta had two altars in Rome and were invoked by pregnant women as protectors against the dangers of childbirth.[4] Antevorta was said to be present at the birth when the baby was born head-first; Postverta, when the feet of the baby came first.[citation needed] According to Aulus Gellius, a 2nd-century Roman grammarian, writes—citing the older author 1st-century BCE author Varro—that altars were constructed to the gods Postverta and Prorsa so as to avert the risk of difficult childbirth.[5][6]