Mammals are born alive from their mothers.

哺乳动物是从母体中分娩出来的。

The following table is average born alive per year.

下面的表格是每年平均产活仔数。

If an infant is born alive ...or "premature baby," not "fetus."

"prematurely"是副词，意思是"未成熟地，太早地，早熟地"。 本句应译为：如果一个婴儿早产并存活，那么合适的称呼应该是早产婴或者早产宝宝，而非胎儿。

He is not able to say positively whether it was born alive or dead.

他不能确定孩子是否一出生就死了。

The law of homicide can only apply in situations where a child is born alive.

法适用的情况下，只能凶杀孩子出生活着。