1. What is Percent Birth Weight Loss?

Percent birth weight loss is a calculation used to assess how much weight a newborn has lost compared to their birth weight. This is particularly important in the first days after birth to monitor adequate feeding and hydration.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• Birth Weight — The newborn's weight at birth (kg)
• Current Weight — The newborn's current weight (kg)

Explanation: The formula calculates what percentage of the original birth weight has been lost.

3. Importance of Monitoring Weight Loss

Details: Newborns typically lose 5-7% of their birth weight in the first few days. Losses greater than 10% may indicate feeding problems or other issues requiring medical attention.

4. Using the Calculator

Tips: Enter birth weight and current weight in kilograms. Both values must be positive numbers, with current weight typically less than birth weight.

5. Frequently Asked Questions (FAQ)

Q1: What is normal weight loss for a newborn?
A: Most newborns lose 5-7% of birth weight in first 3-5 days, then regain it by 10-14 days.

Q2: When should I be concerned about weight loss?
A: Consult a pediatrician if loss exceeds 7% in first 72 hours or 10% at any time.

Q3: How often should newborns be weighed?
A: Typically at birth, 24 hours, 48 hours, and at first pediatric visit (3-5 days old).

Q4: Does breastfeeding affect weight loss?
A: Breastfed babies may lose slightly more weight initially but catch up within 2 weeks.

Q5: What factors affect birth weight measurements?
A: Time of first weighing (after fluid loss), scale calibration, and infant hydration status.