When should catch-up growth occur after preterm birth?

Most preterm SGA infants show catch-up in head circumference by 18 months and weight by 24 months corrected age. Height catch-up may continue until age 4–6 years. Failure to demonstrate catch-up by 2 years corrected age warrants endocrine and nutritional evaluation.

What centile crossing is considered significant?

Crossing 2 or more major centile lines (e.g., 75th to 25th percentile) downward on a growth chart over any 6-month period is considered significant and requires investigation. Upward centile crossing is typically reassuring but extreme crossing warrants assessment for pathologic causes.

Catch-Up Growth Centile Crossing Criteria

Assess catch-up growth adequacy in SGA or post-illness children by evaluating centile crossing toward mid-parental height target range within expected timeframes.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.

How to Use

Enter the values for the scenario you are assessing. Assess catch-up growth adequacy in SGA or post-illness children by evaluating centile crossing toward mid-parental height target range within expected timeframes. Use the catch-up growth result to inform your calculation.

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Growth Velocity SDS

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WHO Weight-for-Length