What group of mammals have a) embryos that spend more time feeding through the placenta than the mother's nipples, b) young that feed on milk, and c) a prolonged period of maternal care after leaving the placenta?

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Eutheria (placental mammals) have embryos that spend more time feeding through the placenta than the mother's nipples, young that feed on milk, and a prolonged period of maternal care after leaving the placenta. Monotremes have young that hatch from eggs and Marsupials have a short period of placental development followed by development outside of the uterus in a pouch, so they do not match all three criteria.

What Group of Mammals Have A) Embryos That Spend More