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The Influence of Gestational Age on the Ability of the Fetus to Pass Meconium in Utero: Clinical implications

Meconium-stained amniotic fluid is a common obstetric finding. Its incidence ranges between 7 and 30% of all deliveries (1 ) . Interest in meconium-stained amniotic fluid has centered mainly on the factors that promote its passage in utero, principally asphyxia, and its effect on the neonate, such as meconium aspiration. Recently, we, as well as others, have observed that the antepartum passage of meconium is a phenomenon principally observed in the mature fetus (4). We report our further experience on the role of gestational age in determining the ability of the fetus to pass meconium in utero and discuss the clinical implications of this observation.