A 1-month-old breastfed baby is brought to your office by his parents for his well-baby...

This infant was born at 32 weeks’ gestation and therefore growth must be interpreted using corrected (adjusted) age , not chronological age. At 1 month chronological age, his corrected age is approximately term (40 weeks). MCCQE pediatric objectives emphasize that preterm infants commonly shift percentiles after birth due to expected postnatal fluid changes and adaptation. A drop from the 50th to the 10th percentile in the first month—particularly in a clinically well, breastfed infant—can be normal when plotted appropriately on preterm growth charts and corrected for gestational age. There is no information suggesting feeding difficulty, malabsorption, or systemic illness. A sweat chloride test (for cystic fibrosis) or celiac serology is not indicated in a thriving 1-month-old infant. Routine formula supplementation is unnecessary without evidence of poor intake or failure to thrive. The appropriate management is reassurance, continued monitoring of growth using corrected age, and support for breastfeeding, with follow-up to ensure appropriate weight gain trajectory.