4D ultrasound is generally accurate. 4D ultrasound, usually performed around 24 weeks of pregnancy, can accurately see the baby’s limbs, face, torso and other parts of the body, and can rule out defective conditions such as cleft lip and palate, limb mutilation, and spina bifida. 4D ultrasound has a low impact on the fetus and is an important means of screening for fetal malformations during pregnancy. However, any examination has certain limitations and has a certain degree of error. Maternal belly fat is thicker, affecting ultrasound penetration, affecting the clarity of the examination; fetal immobility or posture blockage, can lead to not be able to fully see the patient’s torso; measured across the belly, staff technical experience, machine clarity, and other aspects of the examination results will also affect the situation. If the 4D examination suggests abnormalities, it is recommended to review the examination and make a comprehensive assessment under the guidance of the doctor.