Calculadora Peso Bebê Percentil
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Reviewed by Calculator Editorial Team
Use this calculator to determine your baby's weight percentile based on age and gender. The World Health Organization (WHO) growth charts are used as the reference standard.
How to Use This Calculator
To calculate your baby's weight percentile:
- Enter your baby's age in months (0-24 months)
- Select your baby's gender
- Enter your baby's weight in kilograms
- Click "Calculate" to see the results
The calculator will display the percentile rank and provide an interpretation of the result.
Understanding Percentiles
A percentile indicates the percentage of babies who are at or below a certain weight for their age. For example:
- 50th percentile: Your baby is at the median weight for their age
- 90th percentile: Your baby is heavier than 90% of babies their age
- 10th percentile: Your baby is lighter than 90% of babies their age
Note: Percentiles are based on population data and should be used as a general guide. Every baby is unique and grows at their own pace.
Interpreting Results
The WHO growth charts divide babies into categories based on their weight percentile:
- Normal weight: 10th to 90th percentile
- Underweight: Below 10th percentile
- Overweight: Above 90th percentile
While some weight variation is normal, persistent underweight or overweight may indicate health concerns. Always consult with a pediatrician if you have concerns about your baby's growth.
Formula used: The percentile is calculated by comparing your baby's weight to the WHO growth chart standards for their age and gender.
Formula Used
The calculator uses the WHO growth charts as the reference standard. The percentile is determined by:
- Selecting the appropriate growth chart based on baby's age (0-24 months) and gender
- Comparing the baby's weight to the chart's weight-for-age curves
- Calculating the percentage of babies who are at or below that weight
The WHO growth charts are based on data from healthy babies from around the world and are considered the gold standard for infant growth assessment.
Worked Example
Let's calculate the weight percentile for a 6-month-old girl who weighs 6.5 kg.
- Age: 6 months
- Gender: Female
- Weight: 6.5 kg
Using the WHO growth charts, we find that 6.5 kg is at the 45th percentile for a 6-month-old girl. This means your baby is heavier than 45% of babies her age and lighter than 55% of babies her age.
Since 45 falls within the normal weight range (10th-90th percentile), this indicates your baby is growing normally for her age.
Frequently Asked Questions
What is a normal weight percentile for babies?
A normal weight percentile for babies ranges from the 10th to the 90th percentile. This means your baby is growing at a healthy rate compared to other babies of the same age.
What should I do if my baby is in the underweight or overweight range?
If your baby consistently falls outside the normal weight range, consult with your pediatrician. They can provide guidance and may recommend further evaluation.
How often should I track my baby's weight?
It's recommended to track your baby's weight at each well-child visit, typically every 2-4 weeks during the first year of life, and then less frequently as your baby grows.
Can breastfed babies be heavier than formula-fed babies?
Yes, breastfed babies often gain weight more quickly than formula-fed babies. This is normal and doesn't indicate a problem as long as your baby is growing appropriately according to the growth charts.