**Core Concept**
Hypothyroidism in children can lead to various physical and developmental changes due to impaired growth and maturation. The condition affects multiple body systems and can manifest through several distinct clinical features.

**Why the Correct Answer is Right**
Short metacarpals in hands are typically associated with congenital rubella syndrome, not hypothyroidism. Infants with congenital rubella syndrome often have characteristic skeletal abnormalities, including short metacarpals and phalanges. In contrast, children with hypothyroidism may exhibit delayed bone age, delayed puberty, and an altered upper to lower segment ratio, but short metacarpals are not a specific feature of the condition.

**Why Each Wrong Option is Incorrect**
**Option B:** Delayed puberty is a feature of hypothyroidism, as decreased thyroid hormone levels can disrupt normal pubertal development.
**Option C:** Delayed bone age is indeed a feature of hypothyroidism, as the condition can impair growth plate activity and bone maturation.
**Option D:** An altered upper to lower segment ratio is also a feature of hypothyroidism, as the condition can affect growth patterns and lead to an increased ratio.

**Clinical Pearl / High-Yield Fact**
When evaluating a child for delayed growth or puberty, it's essential to consider the possibility of hypothyroidism and perform thyroid function tests (TFTs) as part of the diagnostic workup.

**✓ Correct Answer: A. Short metacarpals in hands**