And Nathan, having delivered the sentence of the Lord, departed unto his house. And the Lord struck the child that Uriah's wife bare unto David, the phrasing once more calling attention to the sin, and it was very sick. The sickness in this case was a direct punishment of God upon the parents.
Related Commentaries of 2 Samuel 12:15
2 Samuel 12:15
15 And Nathan departed unto his house. And the LORD struck the child that Uriah's wife bare unto David, and it was very sick.