**Core Concept**
The calorie requirement at 1 year of age is a critical aspect of pediatric nutrition, as it influences growth and development. The recommended daily calorie intake for a 1-year-old child is based on their age, sex, weight, and activity level.

**Why the Correct Answer is Right**
The World Health Organization (WHO) recommends a daily energy intake of 1,000-1,200 kcal for a 1-year-old child, depending on their sex and activity level. This requirement is based on the child's growth rate and the energy needs for maintenance, growth, and activity. At 1 year of age, children require a balanced diet that includes carbohydrates, proteins, and fats to support their rapid growth and development.

**Why Each Wrong Option is Incorrect**
**Option A:**
This option is incorrect because it is too low for a 1-year-old child's energy needs. Children at this age require a higher calorie intake to support their growth and development.

**Option B:**
This option is incorrect because it is too high for a 1-year-old child's energy needs. While children do require a significant amount of energy, excessive calorie intake can lead to obesity and other health problems.

**Option C:**
This option is incorrect because it is not a standard recommendation for a 1-year-old child's calorie intake. The WHO and other health organizations provide specific guidelines for energy needs at different ages.

**Clinical Pearl / High-Yield Fact**
A child's calorie needs increase significantly during the first year of life, with a 50% increase in energy requirements between 6 and 12 months of age.

**Correct Answer:**
Correct Answer: B. 1200 kcal