**Core Concept:** Congenital inguinal hernia is a medical condition where an internal abdominal organ, usually the intestines, protrudes through a defective inguinal canal, which is the result of incomplete closure of the processus vaginalis during fetal development.

**Why the Correct Answer is Right:** In this case, the correct answer is to **operate** on the child immediately, as congenital inguinal hernia can lead to incarceration, strangulation, and potential obstruction of the internal organs. Inguinal hernias are classified as either direct or indirect, based on the location of the herniated organ. Direct inguinal hernias occur when the intestines protrude through the internal inguinal ring, while indirect hernias involve the herniation of the round ligament of the uterus and the round ligament of the testis.

**Why Each Wrong Option is Incorrect:**

A. **Non-operative management**: This is incorrect because congenital inguinal hernia can lead to complications like incarceration, strangulation, and obstruction of the internal organs. Early surgical repair is crucial to prevent these complications.

B. **Observation**: Observation alone is not recommended for congenital inguinal hernia, as it increases the risk of complications like incarceration, strangulation, and obstruction. The child should undergo surgical repair to prevent these complications.

C. **Observation with ultrasound**: Ultrasound is a valuable tool in assessing the size, type, and presence of any complications in congenital inguinal hernia. However, it does not replace the need for operative management. The correct management is surgery, with ultrasound serving as a supportive tool to assess the condition.

D. **Observation with follow-up**: Similar to option B, observation and follow-up is not sufficient for congenital inguinal hernia. Surgery is necessary to prevent complications like incarceration, strangulation, and obstruction. Follow-up alone cannot address these risks.

**Clinical Pearl:** Immediate surgical repair is crucial for congenital inguinal hernia to prevent complications like incarceration, strangulation, and obstruction. Ultrasound can aid in assessing the condition, but it does not replace the need for surgery. The correct management involves operating on the child to address the risk of complications and ensure proper hernia reduction and mesh placement during surgery.