How to Figure Out What Percentage of Birth Weight Is Lost
- 1). Weigh your baby. Many scales weigh using pounds and ounces (an ounce equals one-sixteenth of a pound). To avoid complicated calculations using fractions, use your scale's metric setting, or convert the pounds-and-ounces figure to a decimal by dividing the number of ounces by sixteen. For example, if your child weighs 6 lb., 10 oz., divide 10 by 16 to determine that your child weighs 6.63 lb.
- 2). Subtract your baby's current weight from her birth weight. This will allow you to determine how much weight she has lost.
- 3). Divide the amount of weight your baby has lost by his birth weight. Remember to use grams -- the metric measurement -- or to convert your baby's birth weight into a decimal by dividing the number of ounces by sixteen.
- 4). Multiply the result by 100 to convert your answer to a percentage.
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