What leads to low levels of amniotic fluid?

Low levels of amniotic fluids can be due to the intake of medicines used to treat high blood pressure. Babies with kidney problems will not be able to make urine which will lead to low amniotic fluid. Several health conditions of the mother like preeclampsia, diabetes, high blood pressure, obesity may lead to low levels of amniotic fluids. 

Question: Does amniotic fluid naturally decrease?- Yes/No

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