As a Calvinist, you believe in infant damnation too. One of the principle lynchpins of Calvinism is Romans 9:
“11Yet, before the twins were born or had done anything good or bad—in order that God’s purpose in election might stand: 12not by works but by him who calls—she was told, “The older will serve the younger.” 13Just as it is written: “Jacob I loved, but Esau I hated.”
So?
And how can anyone waste time debating whether baptism has any relevance at all for salvation? It does not — it can not: Thief on the cross, anyone?
Why do people try to make the simplest things so complex?
Yet, CC’s point is that in Calvinist thought, at least some of the infants who die before they are baptised are elect, so go to heaven anyway. This, he views, as being better than the idea that 100% go to heck