infant; baby; little child
「幼児」 has another reading with different meanings.
young child; toddler
幼児の教育はとても非常に大切だ。
Early childhood education is extremely important.
公園で幼児連れの親子が遊んでいた。
Parents with young children were playing.
幼児向けの教育番組を見ていますね。
I'm watching a program for young children.