“Evil from his youth” — R’ Yudan said: “Mi-ne’urav” is written defectively, [meaning] from the moment he is stirred and emerges into the world.
On the daf / in context: The Yerushalmi focuses on the defective spelling of “mi-ne'urav.” R’ Yudan reads the missing letter as a cue that the phrase refers not merely to chronological youth but to the moment a person is stirred into life and emerges into the world. The derashah therefore connects the verse’s description of human inclination to its earliest beginning.
Type of Learning
Custom (defective spelling indicating the yetzer is present from birth / early stirring).
What Is Learned
The yetzer is present from the earliest stirring of life; practical implications include distancing from a child’s waste once he can eat a kezayit of grain.