I heard most dolphins are born tail first. I have read many explanations from books and internet articles and they said that dolphins are born tail first to prevent them from drowning.

But now I don't get this explanation. There must be no air in the mother's womb, so the baby dolphin can't breathe either way. I think they get oxygen from the umbilical cord until it's disconnected.

If this is true, why would they drown if they are born head first? Why are dolphins born tail first unlike most mammals?

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    $\begingroup$ Searching on youtube you find videos of head-first births of whales. So, even though tail-first seems to be more common, head-first does work. Since tail-first is otherwise uncommon in mammals, there is probably an evolutionary advantage to it. Maybe drowning becomes a problem in the head-first situation if the process is taking too long. $\endgroup$ – Frieke May 11 '19 at 18:58

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