Track your baby's development and understand their growth curve with our easy-to-use percentile calculator.
A baby growth percentile chart, based on data from the World Health Organization (WHO), is a standard tool used by pediatricians to track a child's growth over time. When your baby is in the 40th percentile for weight, it means that compared to 100 babies of the same age and sex, your baby weighs more than 40 of them and less than 60 of them. It is a comparison tool, not a grade!
While it's natural to focus on the specific percentile number, what pediatricians value most is the consistency of the growth curve. A healthy baby will typically follow their own unique curve over time. This means that a baby who is consistently in the 10th percentile is often just as healthy as a baby who is consistently in the 90th percentile. The key is steady growth along their personal track.
A percentile shows how your child's growth compares to other children of the same age and sex. For example, the 50th percentile is the statistical average. A lower or higher percentile doesn't mean your child is unhealthy; the consistency of their growth curve is what matters most.
Not necessarily. A low percentile can be perfectly normal, especially if the baby is consistently following their own growth curve. If your pediatrician observes a sudden drop across two or more percentile lines (e.g., from the 50th to the 20th), they may investigate further, but a steady curve at a lower percentile is usually not a cause for concern.
This calculator uses a simplified model based on the World Health Organization (WHO) growth standards, which are recommended for children up to 24 months of age. These charts are based on data from healthy, breastfed infants from diverse backgrounds and are considered the international standard for infant growth.
Your pediatrician will measure your baby at regular well-child visits. It's best to follow their schedule. Checking too frequently at home can cause unnecessary anxiety, as growth happens in spurts. This tool is best used to understand the measurements taken at official doctor's visits.