The amount of calories required at 1 year of age are
**Core Concept**
The amount of calories required at 1 year of age is determined by the child's growth rate and activity level, taking into account the energy expenditure for maintenance, growth, and development. This is calculated using the Harris-Benedict equation or the World Health Organization (WHO) growth charts.
**Why the Correct Answer is Right**
At 1 year of age, children require approximately 1,000-1,400 calories per day for optimal growth and development. This energy intake supports the child's basal metabolic rate, physical activity, and growth needs, including the development of brain, muscles, and other tissues. The WHO growth charts provide a reliable estimate of energy requirements for children at different ages.
**Why Each Wrong Option is Incorrect**
**Option A:**
The estimated daily energy requirement for a 1-year-old child is higher than 600 calories per day, which is more typical for a sedentary infant.
**Option B:**
The recommended daily energy intake for a 1-year-old child is lower than 1,000 calories per day, which may not support optimal growth and development.
**Option C:**
The estimated daily energy requirement for a 1-year-old child is higher than 1,600 calories per day, which is more typical for a highly active toddler.
**Clinical Pearl / High-Yield Fact**
Remember that the energy requirements for children change over age, with a peak at 1-2 years, and decrease after 2-3 years. This is due to the rapid growth and development that occurs during early childhood.
**Correct Answer: D. 1,000-1,400 calories per day.**