**Core Concept**
In hypothyroidism, decreased thyroid hormone production affects metabolic rate, leading to various systemic manifestations. In children, this results in changes in growth and development patterns.

**Why the Correct Answer is Right**
Cold extremities are a common feature of hypothyroidism in children due to decreased peripheral circulation and reduced metabolic rate. The reduced metabolic rate leads to decreased heat production, causing cold intolerance and cold extremities. This is because thyroid hormones play a crucial role in regulating the metabolic rate, and their deficiency affects various bodily functions, including cardiovascular and thermoregulatory systems.

**Why Each Wrong Option is Incorrect**
* **Option A:** Cataract is more commonly associated with untreated congenital hypothyroidism, but it's not the most common feature in children.
* **Option B:** Recurrent seizures are not a typical manifestation of hypothyroidism in children. While seizures can occur in some cases, they are not a common feature.
* **Option D:** Laryngospasms are not a typical feature of hypothyroidism in children. Laryngospasm is more commonly associated with conditions like epiglottitis or foreign body aspiration.

**Clinical Pearl / High-Yield Fact**
In children, hypothyroidism can lead to growth retardation, developmental delays, and changes in skin and hair texture. It's essential to recognize these signs and symptoms early to initiate appropriate treatment and prevent long-term consequences.

**✓ Correct Answer: C. Cold extremities**