infancy

1. N-UNCOUNT Infancy is the period of your life when you are a very young child. 婴儿期

...the development of the mind from infancy onwards. …从婴儿期开始的智力开发。

2. N-UNCOUNT If something is in its infancy, it is new and has not developed very much. 初期

Computing science was still in its infancy. 计算机科学仍然处于初期阶段。