Story here is that Neanders were genetically more fertile than Africans. (We're mostly east-African.)
h/t HBDChick as these things usually are. Assuming the same nine-month gestation, more total childbirths would account for the late-shift in Neander maternity.
Late childbearing and the known Neander clannishness (from the low population) would induce morbidities, especially together. They'd need all the extra cubs they could beget.
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