בֶּן יוֹמוֹ (בַּת יוֹמָהּ), תִּינוֹק בֶּן יוֹמוֹ, קָטָן בֶּן יוֹמוֹ

ביטוי (אנגלית)

One-day-old (male / female), a one-day-old infant, a one-day-old child

הגדרה (אנגלית)

At the age of one day. An infant who has just been born.

(“It is taught: Rabban Shimon ben Gamliel says: a one-day-old infant who is alive—one desecrates the Sabbath for him; David, King of Israel, who is dead—one does not desecrate the Sabbath for him… The Torah said: desecrate one Sabbath for him so that he may observe many Sabbaths. David, King of Israel, who is dead—one does not desecrate it for him; once a person has died, he is exempt from the commandments.” — Shabbat 151b; and likewise: “Oil sufficient to anoint the small limb of a one-day-old child. They objected: oil sufficient to anoint a small limb, and a one-day-old child.” — Shabbat 77b; and likewise: “As long as the infant one day old is alive, you do not need to guard him from mice; Og king of Bashan, once dead, must be guarded from mice.” — Rashi, Genesis 9:2; and likewise: “Or things that have living spirit, such as chickens, geese, and a one-day-old calf.” — Bialik / Aryeh Ba‘al Guf, part B))