What is a healthy growth percentile for my baby?

Any percentile between the 5th and 95th is considered normal and healthy. What matters most is that your baby follows their own growth curve consistently over time. A baby at the 25th percentile who stays there is healthier than one jumping between percentiles. Only percentiles below 5th or above 95th may warrant medical attention.

What is the difference between CDC and WHO growth charts?

WHO growth charts (2006) describe how children should grow under optimal conditions and are recommended for ages 0-2. CDC growth charts (2000) show how US children actually grew and are used for ages 2-20. WHO charts are based on breastfed babies from 6 countries, while CDC charts used primarily formula-fed American babies. The AAP recommends WHO charts for infants under 2.

How often should I measure my baby's growth?

Pediatricians typically measure growth at every well-child visit: at birth, 3-5 days, 1, 2, 4, 6, 9, 12, 15, 18, and 24 months, then annually. For premature babies or those with growth concerns, measurements may be more frequent. At home, monthly measurements are reasonable, but avoid daily weighing which can cause unnecessary anxiety.

Why did my baby's percentile drop or jump suddenly?

Single-measurement changes are often due to measurement error, feeding timing, or recent illness. True growth concerns involve sustained changes over 2-3 measurements. Breastfed babies often drop percentiles around 4-6 months compared to formula-fed norms. Always discuss significant changes with your pediatrician, especially drops of more than 2 percentile lines.

What measurements are tracked on growth charts?

Growth charts track three main measurements: weight-for-age, length/height-for-age, and head circumference (for ages 0-3). Additionally, weight-for-length helps assess body proportions. BMI-for-age replaces weight-for-length after age 2. Head circumference is especially important in the first year to monitor brain development.

Should I be concerned about head circumference percentiles?

Head circumference naturally varies with genetics - parents with larger heads often have babies with larger head circumferences. Concern arises when head size is disproportionate to body size, crosses multiple percentile lines rapidly, or is below the 2nd or above the 98th percentile. Consistent tracking of your baby's own curve is more important than comparing to others.

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Growth Percentile Calculator

Last updated: June 2026

Check Your Child's Growth Percentiles

Estimate growth percentiles for your child

Age

Gender

Weight

Height

Head Circumference (optional, under 3 yrs)

First Checkup

2-Month Visit

4-Month Visit

6-Month Visit

9-Month Visit

12m

1 Year

18m

18-Month Visit

24m

2 Years

Common Questions

How do I check my baby's growth percentile?

What is a good growth percentile for a baby?

How accurate are baby growth percentile calculators?

What does the 75th percentile mean for baby weight?

Should I worry if my baby dropped percentiles?

What's the difference between WHO and CDC growth charts?

Medical Disclaimer

This calculator provides educational estimates only and is not a substitute for professional medical advice. Always consult your pediatrician or healthcare provider for guidance specific to your child.

Last reviewed: December 2024|

Sources:CDC Growth Charts WHO Standards