WHO growth chart standardsAges 0–24 monthsBoys & girls percentile curves
Note: This tool is for reference only. Always discuss your baby's growth with your pediatrician.
Enter Baby DetailsFree · Instant
lbs
oz
Growth Percentile Result
Weight Percentile
11th
Weight
7.26 kg
(16 lbs 0 oz)
Your 6-month-old boy weighs more than 11% of babies the same age and sex. This is within the normal range.
Growth Chart Reference (kg), Age 6 months
Percentile
Weight (kg)
Weight (lbs)
3th
6.4
14.1
5th
6.8
15
10th
7.2
15.9
25th
7.9
17.4
50th
8.8
19.4
75th
9.7
21.4
90th
10.4
22.9
95th
10.9
24
97th
11.2
24.7
Your Baby on the Curve
0th25th50th75th100th
How Baby Percentiles Are Calculated
This calculator uses WHO Child Growth Standards (2006), the gold standard for infants and toddlers worldwide. For each age and sex, WHO provides weight values at defined percentiles (3rd, 5th, 10th, 25th, 50th, 75th, 90th, 95th, 97th).
Your baby's weight is compared to those reference values. For ages between the published data points, the calculator interpolates linearly between the nearest two age groups.
Who Is This Calculator For?
👨👩👧
New Parents
Check where your baby falls on the WHO growth curve between doctor visits.
👶
Caregivers
Track weight progress and share data with your pediatrician at checkups.
🏥
Health Providers
Quick reference for weight-for-age screening in the 0–24 month range.
📊
Growth Trackers
Log weight at each well-child visit and compare percentile trends.
How to Use This Calculator
1
Select your baby's sex
WHO growth charts are sex-specific. Boys and girls have different reference weight distributions.
2
Enter age in months
Enter your baby's age from 0 (birth) to 24 months. Use whole months or decimals.
3
Enter current weight
Input weight in pounds and ounces. The calculator converts to kg for the WHO standard.
4
Read the percentile result
See which percentile your baby falls into and how they compare to the reference population.
5
Review the full chart
The table shows all major percentile thresholds for your baby's specific age and sex.
6
Track trends over time
Run this at each well-child visit to watch percentile trends, not just snapshots.
Worked Example
Sarah weighs her son Liam at his 6-month well-child visit. He is a boy, 6 months old, and the scale reads 17 lbs 4 oz (7.84 kg). Where does he fall on the WHO growth chart?
Weight: 17 lbs 4 oz = 7.84 kg
WHO 50th percentile at 6 months (boy): 7.9 kg
WHO 25th percentile at 6 months (boy): 7.3 kg
Liam's percentile: approximately 50th
What Does the Result Mean?
At the 50th percentile, Liam weighs more than about half of all 6-month-old boys in the WHO reference population. This is exactly the median, a healthy, typical result. His pediatrician will want to see consistent tracking along this curve at future visits, not just a single snapshot.
Common Misconceptions
!
Thinking higher is always better
A baby at the 90th percentile is not 'healthier' than one at the 40th. Percentiles describe distribution, not health.
!
Worrying about a single snapshot
One data point means little. Consistent tracking over several visits shows whether your baby is growing along their curve.
!
Confusing WHO and CDC charts
The WHO chart (used here) is recommended for ages 0–24 months. The CDC chart is designed for ages 2–20 years.
!
Panicking over minor fluctuations
Small shifts (5–10 percentile points) between visits are normal, especially around illness or feeding changes.
!
Comparing siblings
Each child has a unique growth trajectory. Comparing siblings is rarely meaningful.
WHO Child Growth Standards: Weight-for-age tables (2006)
WHO · who.int
Use of World Health Organization and CDC Growth Charts for Children aged 0–59 Months in the United States
CDC · cdc.gov
American Academy of Pediatrics: Bright Futures Preventive Care Guidelines
AAP · aap.org
Reviewed By
Dr. Elena Torres, MD
Pediatrician, board-certified, 14 years in practice
Dr. Torres practices general pediatrics in Austin, Texas and has extensive experience in infant growth monitoring and early childhood development. She trains residents in well-child care at a university-affiliated clinic.
Typical Weight by Age (50th %ile)
Age
Boy
Girl
Birth
3.5 kg
3.3 kg
1 mo
4.8 kg
4.5 kg
2 mo
6 kg
5.5 kg
3 mo
6.9 kg
6.2 kg
4 mo
7.6 kg
6.9 kg
6 mo
8.8 kg
7.9 kg
9 mo
9.8 kg
8.9 kg
12 mo
10.6 kg
9.8 kg
18 mo
12 kg
11.3 kg
24 mo
13.3 kg
12.6 kg
💡 Pro Tip
Percentile ranking matters less than trend. A baby consistently at the 10th percentile and growing steadily is healthier than one dropping from the 50th to 10th percentile over several visits.