The malformations that can be detected by 4D ultrasound are cleft lip and palate, hydrocephalus, hydrocephalus, megacolon, and short limb deformities. You can go to the hospital for a 4D ultrasound during the 22-28 weeks of pregnancy to screen for most of the malformations in the fetus. At this time, the fetus’ limbs and organs are fully developed and suitable for 4D ultrasound. It can screen whether the fetus has cleft lip and palate, hydrocephalus, brain bulge spinal deformity and so on. It can also screen for abnormalities such as polycystic kidneys, hydronephrosis, megacolon, short limb deformities, biliary atresia, etc. These conditions may not be fatal but require prompt medical attention. It is important to be on time for your maternity checkups during pregnancy, but it is possible that a 4D ultrasound may not detect some subtle malformations.