Calculate the corrected age of a premature baby — the age adjusted for weeks born early.
A baby born at 32 weeks is 8 weeks early. At 4 months of chronological age, the corrected age is about 2 months — and the developmental milestones that matter are the ones for 2 months, not 4.
Corrected age is chronological age minus the number of weeks born before 40 weeks (full term). Paediatricians use it until the child is 2 years old for motor and cognitive milestones, and until 3 years for some growth charts.
This is an informational tool, not a medical assessment. Every premature baby is different, and the paediatrician who follows the child is the one who interprets the milestones in context.
Corrected age = chronological age − (40 − gestational age at birth) weeks.
Most paediatricians use it until 2 years for developmental milestones. After that, the difference matters less.
Yes — the WHO growth charts should use corrected age for premature babies until at least 2 years.
No — it is a calculation tool. The paediatrician who follows your child is the one to interpret the milestones.
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