What would be the best formula to use to answer this problem?

Question

A nurse at a pediatric clinic assessing the fluid in caloric intake for an infant who weighs 5 kg and fed a commercial infant formula. The provider recommends that the infants eat just at least 2.5 mg of formula per kg/day, and the formula contains 20 calories per ounce. What is the minimum number of calories per day the infant should consume?

Answer 1

This is a two-step calculation problem. the best approach would be

Step 1: Calculate the minimum volume of formula per day Using the Weight-Based Dosage Formula:

Minimum Volume = Weight (kg) × Recommended dose (mL/kg/day)

5 kg × 2.5 mL/kg/day = 12.5 mL/day

Step 2: Convert mL to ounces then calculate calories Using the Calories Calculation Formula:

Total Calories = Volume in ounces × Calories per ounce

1. First convert: 12.5 mL ÷ 30 mL/oz = 0.42 oz
2. Then calculate: 0.42 oz × 20 cal/oz = 8.4 calories/day

Answer: The infant should consume a minimum of 8.4 calories per day

Answer 2

In this scenario, you must have a conversion factor for mg to calories (or kilocalories). The conversion I would use would be 1mg = 0.007716kcal.

2.5mg 5kg 0.007716 kcal 1000 calories 96.45 calories

------------ X ----------- X ------------ X ------------ = ------------------

kg/day 1 1 mg 1 kcal day

***The problem requests to know how many calories per day should be minimally required of a 5kg child. It does not ask for the answer in ounces and therefore the conversion to ounces is unnecessary.