Fetal femur shortness at 28 weeks of pregnancy may be due to various reasons such as measurement factors, genetic factors, fetal calcium deficiency, fetal malformation, etc., which need to be analyzed specifically.
1. Measurement factor: it may be due to the fetal position or the measurement equipment is not precise enough, resulting in measurement error, at this time, you need to take a second measurement of the fetus to clarify the length of the femur.
2. Genetic factors: if the parents of the fetus are short, then it may cause the skeleton of the fetus to be shorter than others of the same age, which is also normal.
3. Fetal calcium deficiency: If the pregnant woman has insufficient calcium intake or less absorption during pregnancy, the nutrition supply to the fetus will be insufficient, which will result in fetal growth retardation.
4. Fetal malformation: If the fetus suffers from congenital genetic disease or maldevelopment, it may have malformation, resulting in a short femur.
There may be other reasons for short femur at 28 weeks of pregnancy, it is recommended to go to the hospital in time, under the guidance of the doctor to clarify the cause of the disease, and take appropriate intervention measures.