First you don’t have an anomaly. An anomaly presupposes you have some sort of history or precedence to compare against. You don’t have that.
A singularity is usually assumed for the Big Bang (BB) based upon Einstein’s equations gravity. However, they are inadequate as they don’t consider quantum effects. We don’t know what happens at the singularity at the earliest moments of the universe because we don’t have data nor equations to handle it. As always quoted, all known laws of physics break down at the singularity. I don’t know enough to defend all this, just enough to know that we don’ t have enough information to definitely say what happened at the singularity, especially before the inflation of the universe.
You can’t define what change is if you don’t know what you got in the first place. Infinity is not a cure all for non-knowledge.