1. What is Percent of Birth Weight?

The Percent of Birth Weight calculation shows how a child's current weight compares to their birth weight. This is particularly important for monitoring growth in newborns and infants, especially premature babies or those with growth restrictions.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( current\_weight \) — Current weight in kilograms
• \( birth\_weight \) — Birth weight in kilograms

Explanation: The formula calculates what percentage the current weight is of the original birth weight, providing insight into growth patterns.

3. Importance of Tracking Weight

Details: Monitoring weight relative to birth weight helps assess proper growth and nutrition. Most babies lose some weight initially but should regain birth weight by 2 weeks and double it by 4-6 months.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is normal weight loss after birth?
A: 5-10% weight loss in first week is normal for breastfed babies, with regain expected by 10-14 days.

Q2: When should birth weight double?
A: Typically by 4-6 months, though premature babies may take longer.

Q3: How often should weight be measured?
A: Weekly in first month for concerns, less frequently for healthy term infants.

Q4: Does this apply to all ages?
A: Most useful in first year; after 12 months, standard growth charts are more appropriate.

Q5: What if my baby is below birth weight after 2 weeks?
A: Consult pediatrician as this may indicate feeding issues or other problems.