**Core Concept**
The newborn infant's presentation of jaundice and a purpuric rash in the first few days of life suggests a diagnosis of Hemolytic Uremic Syndrome (HUS), a condition characterized by microangiopathic hemolytic anemia, thrombocytopenia, and renal failure.

**Why the Correct Answer is Right**
The correct answer involves administering fresh frozen plasma (FFP) to manage the coagulopathy associated with HUS. The purpuric rash is indicative of thrombocytopenia and microangiopathic hemolytic anemia, which is a hallmark of HUS. FFP helps to replenish coagulation factors and prevent further bleeding complications.

**Why Each Wrong Option is Incorrect**
**Option A:** Administration of vitamin K would be ineffective in managing the coagulopathy of HUS, as it is a condition of microangiopathic hemolytic anemia rather than a deficiency of vitamin K-dependent clotting factors.

**Option B:** Blood transfusions are not the primary management for HUS, as the hemolytic anemia is a result of the microangiopathic process rather than a deficiency of red blood cells.

**Option C:** Corticosteroids are not indicated in the acute management of HUS, as the condition is primarily related to microangiopathic hemolytic anemia and renal failure rather than an inflammatory process.

**Clinical Pearl / High-Yield Fact**
It is essential to differentiate HUS from Hemolytic Disease of the Newborn (HDN), which is often associated with maternal antibodies against fetal red blood cells. In HUS, the hematologic studies for hemolytic diseases are typically negative.

**Correct Answer:** C.