1. What is Newborn Weight Loss?

Newborn weight loss refers to the normal physiological weight reduction that occurs in the first few days after birth. Most newborns lose 5-10% of their birth weight in the first week before regaining it by 2 weeks of age.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( birth\_weight \) — Baby's weight at birth (kg)
• \( current\_weight \) — Baby's current weight (kg)

Explanation: The formula calculates the percentage of weight lost relative to the original birth weight.

3. Importance of Monitoring Weight Loss

Details: Monitoring weight loss helps assess feeding adequacy and identify potential problems. Excessive weight loss (>10%) may indicate feeding difficulties or other medical issues requiring attention.

4. Using the Calculator

Tips: Enter birth weight and current weight in kilograms. Both values must be valid (birth weight > 0, current weight ≥ 0).

5. Frequently Asked Questions (FAQ)

Q1: How much weight loss is normal for newborns?
A: 5-7% loss is typical for vaginal births, 7-10% for C-sections. More than 10% loss warrants evaluation.

Q2: When should babies regain their birth weight?
A: Most regain birth weight by 10-14 days of age. Formula-fed babies may regain slightly faster.

Q3: How often should newborns be weighed?
A: First weight check at 3-5 days old, then as needed based on feeding and weight trends.

Q4: What causes excessive weight loss?
A: Possible causes include inadequate milk intake, breastfeeding difficulties, or medical conditions.

Q5: When should I be concerned?
A: Contact your pediatrician if loss exceeds 10%, baby is lethargic, has few wet diapers, or shows feeding difficulties.