The indication for amnioinfusion is
Amnioinfusion with warm saline can be performed in the presence of variable decelerations due to cord compression in oligohydramnios. 
The role of amnioinfusion in cases of meconium-stained amniotic fluid is not clear. It is routinely used to dilute the meconium and reduce the chance of meconium aspiration syndrome.
Fetal distress
Suspected Renal anomalies
To facilitate labour
Oligohydramnios