infancy
/ˈɪnfənsɪ/noun
mass noun
1- the state or period of early childhood or babyhood幼年; 婴儿期：
a son who died in infancy.
婴儿期夭折的儿子。
1.1
- the early stage in the development or growth of something初期, 摇篮期：
opinion polls were in their infancy.
初起时的民意测验。
1.2
- Law the condition of being a minor【律】未成年。
词源
late Middle English: from Latin infantia 'childhood, inability to speak', from infans, infant- （see INFANT）.