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BACKGROUNDIt remains unclear whether the association between low birth weight and insulin resistance in adulthood has its origin in utero or whether it develops later in life depending on predisposition and exogenous factors.METHODS AND RESULTSTotal glycosylated hemoglobin (TGH) was quantified at delivery in 1295 mother/child pairs serving as a surrogate of maternal and fetal glycemia. Multivariable regression analysis considering gestational age at delivery, the child's sex, maternal body mass index, and smoking during pregnancy revealed that an increase in TGH by 1% in the child was significantly associated with a mean birth weight reduction of 135 g (P<0.0001), whereas the same increase in the mother was associated with a mean birth weight increase of 88 g (P<0.0001). The ratio of fetal/maternal TGH suggests that lighter newborns have a higher percentage of TGH than would be expected from maternal TGH.CONCLUSIONSThe study demonstrates for the first time in a large population that there is an inverse association between TGH of a newborn and its birth weight. This might be due to increased insulin resistance in newborns with lower birth weight. Our data suggest that the pathophysiological mechanisms linking prenatal growth and postnatal sensitivity to insulin are present as early as before birth.

circulation

Response to Letter Regarding Article, “Low Birth Weight, a Risk Factor for Cardiovascular Diseases in Later Life, Is Already Associated With Elevated Fetal Glycosylated Hemoglobin at Birth”