Fetus with large head and short legs depends on whether the femur value is in line with the examination gestational week, if it is within the normal range is normal, femur is less than the minimum standard value and menopause gestational week does not match, consider the following conditions are related to 1, genetic factors: ultrasound examination found a large head, slightly short legs to be combined with the size of the head and body shape of the parents generation to determine. Many people have a large head and a disproportionate body shape, and most of these cases are physiological factors. Observe the pregnant couple if one of them has a large head and short stature, the fetus may belong to genetic problems, do not have too much pressure, regular check-ups will be good. 2, pathological reasons: head large legs very short, excluding family genetic consideration is fetal development malformations, common is the fetal chromosomal abnormalities, in the clinical 21-trisomy incidence is high, and then is dwarfism. Another condition is a large head with legs within the normal range, such as hydrocephalus, which is also well diagnosed by ultrasonography. During the prenatal checkup, once the fetus is found to have a large head or short limbs, don’t be too nervous because most of them are physiological, you should look for further causes and go to a qualified prenatal diagnosis center for further examination if necessary. Usually pay attention to a reasonable diet to help the fetus grow and develop.