Nihoner

“Friend from infancy” in Japanese

Short answer
幼なじみ osananajimi おさななじみ

Friend from infancy in Japanese is “幼なじみ” (osananajimi). Full meaning: childhood friend, friend from infancy, old playmate.

Looking for the other direction? Search any Japanese word in the Nihoner lexicon, or practise what you have learned in the learning games.