**Core Concept**
Uncontrolled glucose levels in a pregnant diabetic mother can lead to various fetal complications due to hyperglycemia-induced metabolic disturbances. Insulin resistance and hyperinsulinemia affect fetal growth and development, often resulting in macrosomia, hypoglycemia, and other metabolic derangements.

**Why the Correct Answer is Right**
The fetus of a diabetic mother is at risk of developing hypoglycemia due to excessive insulin production in response to maternal hyperglycemia. This condition can lead to hypoglycemic episodes in the newborn, which can be life-threatening if not promptly treated. The fetus also has an increased risk of macrosomia, polyuria, and polydipsia.

**Why Each Wrong Option is Incorrect**
**Option A:** Macrosomia is a known complication of diabetic pregnancies, so this option is incorrect.
**Option B:** Hypoglycemia is a well-documented complication of diabetic pregnancies, making this option incorrect as well.
**Option C:** Congenital anomalies, such as cardiac defects, are more common in diabetic pregnancies, so this option is incorrect.

**Clinical Pearl / High-Yield Fact**
Fetal macrosomia is a significant risk factor for birth trauma and cesarean delivery, emphasizing the importance of tight glucose control in diabetic pregnancies.

**Correct Answer:** D.