Track your baby's development with WHO growth standards
Enter your baby's measurements to see how they compare to other babies of the same age and sex.
This baby growth percentile calculator helps you track your infant's development by comparing their measurements against World Health Organization (WHO) growth standards.
A percentile indicates what percentage of babies of the same age and sex are smaller than your baby. For example:
Anywhere from the 3rd to the 97th percentile is generally considered within the normal range. What matters most is that your baby follows a consistent growth curve over time, not a specific percentile number.
This calculator uses simplified approximations based on WHO growth standards, which were developed from data collected on healthy, breastfed babies from diverse ethnic backgrounds and geographic regions.
Note: This tool provides estimates using simplified growth curves. For precise clinical assessment, your pediatrician uses detailed growth charts and considers your baby's complete health picture.
This calculator uses simplified approximations of WHO growth standards. While useful for general tracking, it should not replace professional medical assessment. Your pediatrician has access to detailed growth charts and can interpret results in the context of your baby's overall health.
Not necessarily. Percentiles represent normal variation in growth. If your baby is healthy, feeding well, meeting developmental milestones, and following their own growth curve consistently, being in a lower percentile is usually fine. Discuss any concerns with your pediatrician.
Most pediatricians measure babies at regular well-child visits: frequently in the first few months, then at 6 months, 9 months, 12 months, and annually thereafter. You don't need to measure at home unless your doctor recommends it for specific monitoring.
For premature babies, growth is typically assessed using corrected age (subtracting weeks of prematurity) until age 2. Consult your pediatrician for appropriate growth assessment methods for preterm infants.
It's normal for weight, length, and head circumference to be in different percentiles. Babies grow at different rates in different dimensions. What matters is that each measurement follows a consistent pattern over time.
Weight: Use a baby scale. Length: Lay baby flat on a firm surface, straighten legs gently, mark head and heel positions, then measure. Head circumference: Use a flexible tape measure around the largest part of the head, just above the eyebrows. For medical decisions, rely on measurements taken by healthcare professionals.