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Birth and early development in Eutheria. Eutherians, like their closest relatives the marsupials, give birth to live young. In eutherians, however, the young are nurtured within the body of the mother by the placenta, which allows nutrients to pass from the blood of the mother almost directly into the blood of the young. The placenta also allows oxygen to reach the developing young, thereby making more energy available than in marsupials.
The major divisions among marsupials are similar to those among placentals, an idea first presented in 1964. As a result, the order Marsupialia was later raised to the rank of infraclass under the name Metatheria and divided into two superorders, Ameridelphia and Australidelphia.