24 week pregnancy mild UIGR AND AFI 13.

Hi doctors, My wife is 23 weeks pregnant. AC is 180mm less that 10 percentile. Others measure are between 70-80%tile . And AFI level is 13 CM. I last (1st) pregnancy same AFI level was there but later it was 2 Mm . So it done cesarian delivery at 33 weeks with 2.9 kg babyboy. As of now 3.5 years old but fine motors skill is not up to same age child and also hyperactive. My fist worry how to treat iugr Currently she is taking calicum tab from govt hospital 1000 mg per day in two tabs and folic acid. And d3 sachet. Her diet is not good.  So need any tablet supplement  for protein . Because her protein intake is low. I want to carry pregnancy till 37-38 weeks. Kindly suggest medicine sothat there would be everything fine. Specially iugr treatment.