In the following edit of the original answer, I have tried to explain what I think @motel intended. Here is what he wrote:
"and he visits the sins of the Fathers on the children". Devarim 5:8
This is my version: it is not my view - just an attempt to reveal what he thought.
In Shemos 34 (7) the Torah says,
נֹצֵ֥ר חֶ֙סֶד֙ לָאֲלָפִ֔ים נֹשֵׂ֥א עָוֺ֛ן וָפֶ֖שַׁע וְחַטָּאָ֑ה וְנַקֵּה֙ לֹ֣א יְנַקֶּ֔ה פֹּקֵ֣ד ׀ עֲוֺ֣ן אָב֗וֹת עַל־בָּנִים֙ וְעַל־בְּנֵ֣י בָנִ֔ים עַל־שִׁלֵּשִׁ֖ים וְעַל־רִבֵּעִֽים׃
extending kindness to the thousandth generation, forgiving iniquity, transgression, and sin—yet not remitting all punishment, but visiting the iniquity of parents upon children and children’s children, upon the third and fourth generations.”
The Chizkuni understands this to mean (from Sefaria)
He therefore imposes partial punishment, delaying the balance if the sinner does not repent, or forgiving the penitent sinner by delaying the unexpired guilt indefinitely. He therefore exacts that part from the third or fourth generation of the original sinner. [This is not unfair, as if the original sinner had received his entire punishment, the grandson would never have seen the light of day. Ed.]
The Tzaraas on the baby is an example of this.
