Juramaia is possibly the earliest creature known to give birth to live young. Marsupials and Placentals produce live young by very different methods.
Most mammals are known as placentals where the embryo is kept in the womb and fed and shielded by the placenta.
The Platypus and Echidna are among the few mammals that lay eggs and this restricts the mother to remaining with her offspring.
The mammals began to favour milk over egg yolk as a way to nourish their young. And that is because milk has one key advantage. It’s on tap, and that means that none of it need go to waste.
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