SHOX and fetal growth restriction: The difference from common IUGR is that the degree of short femur (−4.29 SD) is significantly higher than that of the biparietal diameter, head circumference and abdominal circumference (−2.75 SD~−3.75 SD), and the degree of the short long bones of limbs (all far less than 3rd) is more serious than that of another fetus in DCDA and another fetus with SHOX haploinsufficiency (3rd~50th–90th), suggesting that in IUGR fetuses with disproportionately short long bones of the limbs, the possibility of SHOX haploinsufficiency should be considered.