01
Start with the baby's name and sex so the calculator uses the right growth curve.
02
Required for corrected age and comparison with the right preterm growth curve.
03
Enter manually, or use birth date and measurement date.
Years
Months
Weeks
Days
04
Current weight
Latest measurementEnter the weight measured now, or on the measurement date you selected.
Corrected percentile —
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Birth percentile (Fenton): —
ℹ️ This tool is for general tracking and understanding. If you have concerns, please consult a healthcare professional.
Save this preemie growth result to your personal area
Keep the measurement, corrected age, birth week and birth weight context in one place, so the next check is faster and the growth story stays easy to follow.
Frequently asked questions
Chronological age is the time since birth. Corrected age adjusts for prematurity by subtracting the number of weeks the baby was born early.
Corrected age is commonly used to track growth and development in the early months.
Percentiles may change because of growth rate changes, measurement differences (time of day, clothing, scale accuracy),
or switching between growth references such as Fenton and WHO depending on age and birth week.
It is best to look at the overall trend over time rather than a single point.
Birth weight provides a starting point for comparison, especially in preterm babies using Fenton references.
It can help show catch-up growth and overall progress from the beginning.
If there is a consistent drop in percentile over several measurements, very slow growth, feeding difficulties,
frequent vomiting, or you simply feel something is not right, it is a good idea to consult your pediatrician
or a pediatric dietitian.
