1. 胎儿
A foetus is an animal or human being in its later stages of development before it is born.

e.g. Pregnant women who are heavy drinkers risk damaging the unborn foetus.
孕妇酗酒可能会危及腹中胎儿。

noun

1. an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal

Synonym: fetus