Oligohydramnios developing early in pregnancy is less common, and the fetal outcomes are usually poor. This is because prolonged decrease in amniotic fluid may cause compression sequences, such as pulmonary hypoplasia, muscle hypotrophy or joint constriction. Early-onset oligohydramnios may be caused by preterm premature rupture of membranes (pPROM) or decreased secretion of amniotic fluid. Ear...
