名詞 infancy:

1. the early stage of growth or development
   同義詞：babyhood, early childhood
2. the earliest state of immaturity
   同義詞：babyhood

1. Growth is rapid in infancy.
   幼兒期的成長相當快。
2. Tadpoles are the infancy form of frogs.
   蝌蚪是青蛙的幼年形態(tài)。
3. Our new plan is still only in its infancy.
   我們的新計劃仍處于搖籃階段。

in.fan.cy

n.（名詞）
【復數】 in.fan.cies
The earliest period of childhood, especially before the ability to walk has been acquired.
嬰兒期：幼年的時早期，尤指還不會走路的那一段時期
The state of being an infant.
處于嬰兒狀態(tài)
An early stage of existence:
初期：事物存在的早期：
例句：
Space exploration is still in its infancy.
宇宙探索仍處于初級階段

Law The state or period of being a minor.
【法律】 未成年：未成年的狀態(tài)或時期