**Core Concept**
Wredin's test is a diagnostic tool used to assess the viability of a newborn baby, particularly in cases where the baby is suspected to be stillborn. It involves a specific physical examination maneuver to evaluate the presence of fetal circulation.

**Why the Correct Answer is Right**
Wredin's test is significant in live-born fetuses because it helps to confirm the presence of fetal circulation, which is essential for a newborn baby to be considered viable. The test involves compressing the umbilical cord to check for the return of blood into the fetal heart, indicating the presence of circulation. This is a critical assessment, as it helps to determine whether the baby is alive or stillborn. The presence of fetal circulation is a key indicator of a live birth.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because Wredin's test is not related to assessing the presence of fetal heart sounds, which is a different diagnostic approach.
* **Option B:** This option is incorrect because Wredin's test is not a method for determining the gestational age of the fetus.
* **Option C:** This option is incorrect because Wredin's test is not a tool for diagnosing congenital anomalies in the fetus.

**Clinical Pearl / High-Yield Fact**
Wredin's test is a simple, yet crucial diagnostic tool in the assessment of newborn viability. It highlights the importance of physical examination in confirming the presence of fetal circulation, which is essential for a live birth.

**Correct Answer: C.**