infancy infancy /ˈɪnfənsi/

noun

1. () The early stage of growth or development  ( babyhood , early childhood , infancy )
   the early stage of growth or development
     The baby's first year of life is considered infancy.
   The baby's first year of life is considered infancy.
   
2. The earliest state of immaturity  ( babyhood , infancy )
   the earliest state of immaturity