**Core Concept**
The child's presentation of epiphora (excessive tearing) and regurgitation suggests a congenital anomaly affecting the nasolacrimal duct and the esophagus. The nasolacrimal duct is responsible for draining tears from the eye into the nasal cavity, while the esophagus is responsible for swallowing food.

**Why the Correct Answer is Right**
The most probable diagnosis is choanal atresia, which is a congenital blockage of the nasal passage. This condition can lead to epiphora due to the accumulation of tears in the eye. Additionally, the regurgitation of food can occur due to the abnormal anatomy of the esophagus. Choanal atresia is often associated with other congenital anomalies, such as esophageal atresia, which can cause regurgitation.

**Why Each Wrong Option is Incorrect**
**Option A:** Esophageal atresia with tracheoesophageal fistula is a condition where the esophagus is not fully developed, but it does not typically cause epiphora. This condition is associated with regurgitation, but not excessive tearing.

**Option B:** Tracheomalacia is a condition where the trachea is weak and floppy, which can cause respiratory issues. However, it does not typically cause epiphora or regurgitation.

**Option C:** Pierre Robin sequence is a condition characterized by a small lower jaw, tongue displacement, and breathing difficulties. While it can cause feeding difficulties, it does not typically cause epiphora or regurgitation.

**Clinical Pearl / High-Yield Fact**
Choanal atresia is often associated with other congenital anomalies, making a thorough physical examination and imaging studies essential for diagnosis. A high index of suspicion is necessary to identify this condition early, as delayed diagnosis can lead to complications.

**Correct Answer:** D.