low amniotic fluid question

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Hi ladies I'm currently 28 weeks in the hospital due to low amniotic fluid and my babies cord is having issues with the outflow of nutrients. My doctors said she will be a small baby and they also said she has slightly bowed femurs in both legs. She is small and proportionate all around. Does having low fluid cause this? I'm 21 and this is my first baby I'm extremely scared. I have also had noninvasive prenatal testing and all came back fine.