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Weight Loss Percentage Formula:
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The baby weight loss percentage calculates how much weight a newborn has lost compared to their birth weight. It's normal for newborns to lose some weight in the first few days after birth, but excessive weight loss may indicate feeding problems.
The calculator uses the following formula:
Where:
Explanation: The formula calculates what percentage of the original birth weight has been lost.
Details: Monitoring weight loss helps assess whether a newborn is feeding adequately. While some weight loss is normal (typically 5-7%), losses exceeding 10% may require medical evaluation.
Tips: Enter birth weight and current weight in pounds. Both values must be valid (weight > 0, current ≤ birth weight). The calculator will show the percentage of weight lost.
Q1: How much weight loss is normal for newborns?
A: Most newborns lose 5-7% of their birth weight in the first few days. Losses up to 10% may be normal for breastfed babies.
Q2: When should I be concerned about weight loss?
A: Contact your pediatrician if weight loss exceeds 10% or if baby isn't back to birth weight by 2 weeks.
Q3: When do babies typically regain birth weight?
A: Most babies regain their birth weight by 10-14 days of age.
Q4: How often should I weigh my baby?
A: In the first week, daily weights may be helpful. After that, weekly weights are usually sufficient unless there are concerns.
Q5: Does this calculator work for metric measurements?
A: The calculator uses pounds, but the percentage would be the same regardless of units as long as both weights are in the same unit.