Why are some animals capable of living independently from birth, but others have to nurtured by their mothers?

Question

Why are some animals capable of living independently from birth, but others have to nurtured by their mothers?

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Answer 1

In the case of humans it’s about brain development..a fully grown adult brain, along with the skull needed to protect it, would be too large to birth.

So humans do a lot of growing with an undeveloped brain, outside the womb. And as such need constant care and attention.

I suspect this is a factor in other animals too.