English of Core Text: What is the meaning of “vayyitzer” with two yuds? Rabbi Zeira said in the name of Rav Huna: a hint to two formations — formation at seven [months] and formation at nine [months].
On the daf / in context: The doubled letter is taken as an allusion to the two possible gestational periods recognized in halachah.
Type of Learning: Custom (two periods of fetal formation)What Is Learned: The two yuds hint at viable formation at seven months and at nine months.