noun
infancy; childhood; young child
Bound noun used almost exclusively in the pattern 幼にして, meaning 'while still a child' or 'in one's childhood'. Not used as a standalone word for 'child'.
彼は幼にして両親を失った。
He lost his parents while still a child.
幼にしてその才能を発揮した。
He displayed his talent in childhood.