ながらに
乍らに
nagarani

Conjunction

1. while; during; performed in this condition

Usually Written in Kana
かれ子供こどもながらにおかあさんをたすけるために一生いっしょう懸命けんめいはたらいた。
karewa kodomonagarani okāsan'o tasukeru tameni isshōkemmē hataraita.
Child as he was, he worked hard to help his mother.