n.[U]

1. 婴儿期，幼年[S1]
   He has been bright from infancy.

   他从小就很聪明。

2. 初期；未发达阶段
   The industry was still in its infancy.

   这一产业当时仍处于发展初期。

3. 【律】未成年

n.

1. early childhood or babyhood.
2. the early stage in the development or growth of something.
3. Law  the condition of being a minor.