וַיֵּ֥לֶךְ נָתָ֖ן אֶל־בֵּית֑וֹ וַיִּגֹּ֣ף יְהוָ֗ה אֶת־הַיֶּ֜לֶד אֲשֶׁ֨ר יָלְדָ֧ה אֵֽשֶׁת־אוּרִיָּ֛ה לְדָוִ֖ד וַיֵּאָנַֽשׁ׃
And Nathan departed unto his house. And the LORD struck the child that Uriah’s wife bore unto David, and it was very sick.
Read midrashic interpretation of II Samuel 12:15: and classical rabbinic exegesis.