Humans babies are born premature compared to many other animals
The problem is our brains are very large making the birthing process complicated and dangerous for the mother. So babies have to be born very early in development so that their heads will fit through the birth canal.
This results in human babies being virtually helpless for more than a year after they are born, and the death rate among infants is also very high.
Without the advent of modern medical care the childhood death rate is around 20%
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