**Core Concept**
Gastrointestinal anomalies in infants and children can lead to various complications, including umbilical discharge. This condition often involves a patent processus vaginalis, allowing intestinal contents to leak into the umbilicus.

**Why the Correct Answer is Right**
The child's complaint of fluid coming out of the umbilicus on straining is indicative of a patent processus vaginalis, which is a remnant of the peritoneal canal that allows the intestines to move into the scrotum during fetal development. In cases of a patent processus vaginalis, intestinal contents can leak into the umbilicus, causing discharge. This is often seen in conditions such as omphalocele or hernias.

**Why Each Wrong Option is Incorrect**
**Option A:** Hydrocele is a collection of fluid around the testicles, not related to umbilical discharge.
**Option B:** Meconium ileus is an intestinal obstruction in newborns due to meconium impaction, not causing umbilical discharge.
**Option C:** Umbilical granuloma is a benign growth at the umbilicus, not associated with straining or intestinal contents leaking.

**Clinical Pearl / High-Yield Fact**
Be aware that a patent processus vaginalis can lead to complications such as hernias and intestinal obstruction if not addressed.

**Correct Answer:** C. Umbilical granuloma is a benign growth at the umbilicus, not associated with straining or intestinal contents leaking.