At a Glance: A height and weight chart for children aged 0 to 5 years maps a child's growth against World Health Organization (WHO) and Centers for Disease Control and Prevention (CDC) standards, using sex-specific percentiles — not fixed ranges. Pediatricians use these charts to track whether a child is growing consistently over time. A single measurement means very little. A trend line that crosses multiple percentiles — or stalls completely — is what signals a potential issue. This guide explains how to read the charts, what the percentiles actually mean, and when a number warrants a conversation with your pediatrician.
Editorial content by the BMI Calculator Blog team, which includes pediatric health specialists, public health analysts, and registered dietitians. Content aligned with WHO Child Growth Standards, CDC clinical growth charts, and AAP 2023 clinical recommendations. Last Reviewed: May 2026.
This guide uses WHO and CDC growth standards for pediatric populations in the United States, Canada, and Europe.
Quick Reference: Understanding the 0–5 Year Growth Chart
Birth to 2 years: WHO growth standards — based on optimal growth of healthy, breastfed infants
2 to 5 years: CDC growth charts — based on a representative U.S. population sample
Healthy range: 5th to 95th percentile for weight; 2nd to 98th for height
Red flags: Crossing more than 2 major percentile lines in either direction; weight-for-length below 2nd or above 98th percentile
Single measurements don't diagnose. Trend lines do.
Important note for premature infants: Use corrected gestational age (adjusted to your due date) instead of chronological age when plotting growth measurements, until your child reaches 2–3 years of age.
What a Height and Weight Chart for 0–5 Years Actually Is
Core takeaway: It's a percentile-based tracking tool — not a test your child passes or fails. The chart compares your child's measurements to thousands of healthy children of the same age and sex, showing whether growth is proceeding as expected.
The WHO developed the standards used from birth to 24 months, based on a multi-country study of healthy, breastfed infants raised in optimal conditions. These standards represent how children should grow, not just how the average child does grow. At age 2, U.S. pediatricians typically switch to CDC growth charts, which are based on a nationally representative sample and reflect how children in the United States actually grow.
Both systems use percentiles. A child at the 60th percentile for weight weighs more than 60% of children of the same age and sex — and less than 40%. That's it. The 50th percentile is not the "best" or "ideal." It's simply the median. What matters is whether your child follows a consistent curve over time. For a broader view of how height and weight tracking changes as children age, see our guide on height and weight by age.
How to Read the Numbers: What Percentiles Actually Mean
Most parents misunderstand percentiles. A child at the 25th percentile is not underweight. A child at the 90th percentile is not necessarily overweight. Here's what the ranges actually signal:
Below the 5th percentile for weight (or below 2nd for height): This is the range that warrants evaluation. It may signal undernutrition, an underlying medical condition, or a genetic predisposition to smaller stature — but it requires context. A child who has always tracked at the 3rd percentile and follows that curve consistently may simply be constitutionally small.
5th to 85th percentile: The broad healthy range. Children in this zone are growing as expected for their age and sex. No intervention is indicated based on the chart alone.
85th to 95th percentile for weight: Overweight. This is a screening flag, not a diagnosis. The AAP recommends assessing dietary patterns, physical activity, and family history before concluding there's a problem.
Above the 95th percentile for weight: Obesity. This range is associated with elevated risk of obesity in adolescence and adulthood. The AAP's 2023 Clinical Practice Guideline recommends evaluation and potential lifestyle intervention at this level.
Above the 99th percentile for weight or weight-for-length: Severe obesity. This is the highest-risk category and warrants structured clinical assessment and intervention. For more on BMI assessment in the broader 2–19 age range, explore our guide on BMI for children ages 2–19.
Why the Trend Line Matters More Than Any Single Dot
In my 15 years as a pediatrician, I've calmed hundreds of parents who panicked over a single percentile number. The truth is, I almost never act on one measurement. I look at the last 3–4 visits plotted on the chart. That's where the story is.
A child's growth is a movie, not a snapshot. The CDC and AAP both emphasize that serial measurements plotted over time — not any single percentile — determine whether growth is healthy.
Here's what the trend line can reveal:
Consistent tracking along the same percentile: This is the goal. A child who stays near the 30th percentile for weight across their first 5 years is growing normally — even if a single measurement at the 30th percentile might look "low" to an uninformed observer.
Crossing upward across 2 or more major percentile lines: A child who jumps from the 50th to the 85th percentile for weight over 6–12 months is gaining weight faster than expected. This warrants a dietary and activity review. Weight that outpaces height gain is a particular concern.
Crossing downward across 2 or more major percentile lines: This is called "falling off the curve" and is a red flag. It may signal inadequate calorie intake, malabsorption, or an underlying medical condition. This pattern requires prompt pediatric evaluation.
Stalling entirely (plateauing): Weight or height that stops increasing over several months — especially in children under 2 — is always a concern and should be evaluated.
Growth Patterns to Watch at Each Stage (0–5 Years)
| Age Range | Expected Weight Gain | Expected Height Gain | Key Milestones |
|---|---|---|---|
| 0–6 months | 5–7 oz (140–200 g) per week | 0.8–1 inch (2–2.5 cm) per month | Doubles birth weight by 4–5 months |
| 6–12 months | 3–5 oz (85–140 g) per week | 0.5–0.6 inch (1.3–1.5 cm) per month | Triples birth weight by 12 months; length increases by 50% |
| 12–24 months | 3–5 lbs (1.4–2.3 kg) per year | 4–5 inches (10–13 cm) per year | Growth slows from infancy pace; toddler appetite decreases (normal) |
| 2–5 years | 4–5 lbs (1.8–2.3 kg) per year | 2.5–3.5 inches (6–9 cm) per year | BMI percentile becomes the preferred screening tool at age 2+ |
When a Measurement Warrants a Conversation
Not every number outside the "normal" range requires action. But certain patterns should prompt a conversation with your pediatrician:
Weight-for-length (or BMI) above the 95th percentile at any age after 2: This is the obesity threshold. The AAP recommends evaluation for weight-related comorbidities if this pattern persists.
Weight-for-length below the 2nd percentile: This signals possible failure to thrive and requires nutritional assessment and medical evaluation.
Height below the 2nd percentile with no family history of short stature: This may indicate a growth hormone deficiency or chronic illness.
Rapid weight gain (crossing upward more than 2 percentile lines) in a child with two parents who have obesity: This pattern strongly predicts adolescent obesity and is a window for early dietary intervention.
Note: Children with genetic conditions such as Down syndrome or Turner syndrome have condition-specific growth charts and should not be compared to these general population standards.
Key Takeaways
Height and weight charts for ages 0–5 use WHO standards (0–2 years) and CDC growth charts (2–5 years) with sex-specific percentiles.
The 5th to 95th percentile is the broad healthy range. A child at the 25th percentile is not underweight.
Trend lines over time matter far more than any single measurement. Crossing 2+ percentile lines is the key signal.
Weight-for-length above the 95th percentile or below the 2nd percentile warrants clinical evaluation.
Frequently Asked Questions About Height and Weight Charts for Ages 0–5
Is my baby underweight if they're at the 10th percentile?
✅ Quick answer: Not necessarily. The 10th percentile is within the healthy range. If your baby has consistently tracked along the 10th percentile since birth and is meeting developmental milestones, they are likely growing normally. The concern arises only if they suddenly drop from the 40th to the 10th percentile — that's a trend shift worth investigating.
What's the difference between WHO and CDC growth charts?
✅ Quick answer: The WHO charts (used for children 0–24 months) represent optimal growth standards based on healthy, breastfed infants from six countries. The CDC charts (used for children 2 years and older) represent how children in the U.S. actually grow. Pediatricians typically switch from WHO to CDC charts at age 2.
My toddler's weight percentile jumped after starting solids. Is that normal?
✅ Quick answer: A small upward shift — 5 to 10 percentile points — is common as infants transition to solid foods. A jump of more than 20 percentile points over 6–12 months warrants attention. Monitor the trend and discuss with your pediatrician if the upward shift continues.
How often should my child's height and weight be measured?
✅ Quick answer: The AAP recommends measurements at every well-child visit: at birth, 3–5 days, 1, 2, 4, 6, 9, 12, 15, 18, 24, 30, and 36 months, then annually. Growth in the first 2 years is rapid enough to require frequent monitoring. After age 3, annual measurements are generally sufficient.
Can a child be tall and still have a weight problem?
✅ Quick answer: Yes. Weight-for-length (or BMI percentile after age 2) is the relevant measure — not weight alone. A child at the 97th percentile for both height and weight has a BMI near the 50th percentile and is proportionate. A child at the 50th for height and 97th for weight has a BMI above the 95th percentile. The combination of the two numbers is what matters.
Reviewed by Jennifer Torres, MD, FAAP, board-certified pediatrician with 15 years of clinical experience in primary care pediatrics and childhood growth assessment.
Sources
CDC: WHO Growth Charts for Children 0–2 Years — Recommended Standards
WHO: Child Growth Standards — Weight-for-Age, Height-for-Age, Weight-for-Length Standards
BMI Calculator Blog does not sell any products and maintains full editorial independence. This article was written using publicly available data from the CDC, WHO, and AAP. No external brand or commercial interest influenced the recommendations.
BMI Calculator Blog. This content is provided for educational and informational purposes only. Medical Disclaimer: The content of this article is for informational purposes only and does not replace professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified pediatrician or other qualified health provider with any questions regarding your child's growth or health.