**Core Concept**
The condition described is likely a case of postpartum hemorrhage (PPH) or a similar issue related to vaginal bleeding in a newborn. This scenario requires prompt identification and management to prevent complications. The underlying physiological principle involves the regulation of uterine tone and bleeding after childbirth.

**Why the Correct Answer is Right**
In a female newborn presenting with vaginal bleeding 4 days after birth, the primary concern is a potential coagulopathy or thrombocytopenia, which can be due to maternal conditions such as antiphospholipid syndrome or severe preeclampsia. **Option _______** is the correct approach as it involves immediate consultation with a pediatrician or neonatologist for further evaluation and management, including laboratory tests to rule out coagulopathy.

**Why Each Wrong Option is Incorrect**
**Option A:** Administering oxytocin without proper evaluation would be inappropriate, as this medication may worsen bleeding in cases of coagulopathy or thrombocytopenia.
**Option B:** Performing a pelvic exam may not be feasible or necessary in a newborn and could potentially cause further bleeding or trauma.
**Option C:** Prescribing anticoagulant medications without proper diagnosis would be contraindicated, as these medications can exacerbate bleeding disorders.

**Clinical Pearl / High-Yield Fact**
In the case of vaginal bleeding in a newborn, it's essential to consider maternal conditions, such as antiphospholipid syndrome or severe preeclampsia, which can increase the risk of coagulopathy or thrombocytopenia in the baby.

**Correct Answer:** C. Consult a pediatrician or neonatologist for further evaluation and management.