Gestational diabetes status modifies pre‐pregnancy <scp>BMI</scp> associations with large for gestational age: A prospective cohort study in central China

GDM status significantly modifies the relationship between pre-pregnancy BMI and LGA risk, identifying a threshold that substantially increases risk in women with GDM and revealing subgroup-specific vulnerabilities. These findings suggest that incorporating pre-pregnancy BMI and estimated risk of developing GDM into early risk stratification can help identify high-risk pregnancies, thereby guiding targeted antenatal monitoring and individualized interventions of varying stringency to prevent LGA.