Preterm Baby Infant Growth Chart Calculator

23-41 Weeks: Length For Age Percentile

Weight Age 23-41 Length Age 23-41 Head Circum 23-41

Are you able to help others? Share this page.


This app uses tables and data solely based on United States premature babies. Caution should be used on all charts for the twenty-third week for percentiles at or below the 3rd percentile and at or above the 97th percentile. This is due to a low population size. For the twenty-fourth week, the data is skewed to the left for all head circumference data. See the reference below for more information.

This calculator provides your baby's length percentile based on age. The percentile shows how your infant's length compares to other infants. The percentile tells you what percentage of babies who are shorter than your baby. For example out of a sample of 100 babies, a percentile value of 40 percent means your baby is longer than more than 40 babies and shorter than the other 60 babies.

A percentile of 50% represents the average or mean weight. A value below 50 percent means a baby is shorter than average. A value greater than 50 percent means a baby is above average. A doctor or physician should be consulted to determine growth status.

Calculation Instructions:

  1. Select Gender - Choose male for boys and female for girls.
  2. Measure Date - Enter the day the measurement was taken.
  3. Due Date - Enter the original due date. Note, this calculator assume 280 days between first day of last menstrual period (LMP) to birth.
  4. Enter Length - The laying down distance of the child
  5. Select Units
    • cm - Metric centimeters
    • in - Standard inch


  1. Percentile - The length percentile of the child.
  2. Gestational Age - The time period from the first day of LMP to the measure date in weeks
  3. Weight - The length of the child in metric and standard units.
  4. Graph Plot - Length versus Age graph with 5, 10, 25, 50, 75, 95 and calculated percentile lines.


Olsen, Irene E, Sue A. Groveman, M. Louise Lawson, Reese H. Clark and Babette S. Zemel. "New Intrauterine Growth Curves Based on United States Data". Pediatrics 25 January 2010. Print.

Child Height Predictor:

Child Height Predictor - Predict Adult Height

CDC Recommended Growth Charts:

The United States Center for Disease Control (CDC) recommends using the World Health Organization (WHO) charts for the first two year of life (0 to 2 years). After two years, it is recommended to return to the CDC charts.

Weight-Age (WHO 0-2 years) Length-Age (WHO 0-2 years) Weight-Length (WHO 0-2 years) Head Circumference-Age (WHO 0-2 years)

Weight-Age (CDC 2-20 Years) Stature-Age (CDC 2-20 Years) Weight-Stature (CDC 2-20 Years)

CDC Growth Charts:

Weight-Age (CDC 0-3 years) Length-Age (CDC 0-3 years) Weight-Length (CDC 0-3 years) Head Circumference-Age (CDC 0-3 years) Weight-Age (CDC 2-20 Years) Stature-Age (CDC 2-20 Years) Weight-Stature (CDC 2-20 Years)

WHO Growth Charts:

Weight-Age (WHO 0-5 years) Length-Age (WHO 0-2 years) Height-Age (WHO 2-5 years) Weight-Length (WHO 0-2 years) Weight-Height (WHO 2-5 years) Head Circumference-Age (WHO 0-5 years)

Chinese Growth Charts:

Weight-Age (China 0-18 years) Length-Age (China 0-3 years) Height-Age (China 3-18 years) Head Circumference-Age (China 0-6 years) Weight-Length (China 0-3 years) Weight-Height (China 3-18 years)

Preterm Infant Growth Charts:

Weight-Age (23-41 Gestational Weeks) Length-Age (23-41 Gestational Weeks) Head Circumference-Age (23-41 Gestational)

Email Contact and Privacy Policy:

Contact: Privacy Policy - Legal Disclaimer

Popular Pages:

Sale Discount Calculator - Percent Off Loan Calculator Mortgage Extra Payment Paycheck Overtime Rate Calculator Jobs Salary Pay Check Converter Temperature Converter Fraction Calculator - Simplify Reduce Engine Motor Horsepower Calculator Earned Value Project Management Present Worth Calculator - Finance Constant Acceleration Motion Physics Statistics Equations Formulas Mortgage Loan Calculator - Finance Weight Loss Diet Calculator Body Mass Index BMI Calculator Light Bulb Energy Cost Analysis Automobile Fuel Economy - Gasoline Tire Size Comparison Calculator Water Pump Calculator - Hydraulics Geometry Square Circle Cylinder Triangle Calculator Torque Calculator Density Calculator Pressure Calculator Power Calculator Force Calculator


Use this calculator at your own risk. This calculator may or may not be accurate or reliable. By using this calculator you acknowledge any reliance on this calculator shall be at your sole risk.

View Jimmy Rayamond's profile on LinkedIn

AJ Design Software:
Technical Tools, Specifications, How to Guides, Training, Applications, Examples, Tutorials, Reviews, Answers, Test Review Resources, Analysis, Homework Solutions, Help, Data and Information for Engineers, Technicians, Teachers, Tutors, Researchers, K-12 Education, College and High School Students, Science Fair Projects and Scientists