24week pregnancy. Of deficiency of what?

Hi doctors In 6th month pregnancy. USG was done AC is 2 weeks legging and also length of hands are also small. AFI is 13. Position - Breech Fundal placenta anterior grade 1 upper and middle uterine without previa. She already taking  iron calcium and vitamin d3 sachet. In her USG  AC is 2 weeks 4 days lagging  at 24 week pregnancy less than 10 percentile. It's mild assymetrical IUGR. In Her CBC report HB -11.4 low ( 12-15) PCV- 32.6 low  (40-60) RBC 3.4 low      (3.8-4.8) MCV 97.4 normal MCH 34.4  high (27-32) Platlets 133 low Rest perimeters are normal. And Glucose fasting 82 TSH 1.3 (KFT) Urea serum -  14 low (17-56) Creatnine- 0.5 low (0.6-1.2) eGFR- 145 normal or high LFT is normal but triglicyride- 167 high (<150) In urine test pH -8 Epithelial Cells   4-6 Rest are normal. Now her food eating habbit is not good. Not eating proper healthy diet. Because of less appetite. Also for last 5-6 days.why feotus growth is slow. is it because of deficiency of what? pls guide.