Genetics is still in its ______ in parts of the world.(infant)

Genetics is still in its ______ in parts of the world.(infant)
【正确答案】：infancy
【题目解析】：考查词组ininfancy：在萌芽状态，在初期。故将infant（婴儿）改为infancy，意为：初期，婴儿期。答案为infancy。