Fetal abnormalities are conditions that affect a fetus or embryo, are able to be diagnosed prenatally, and may be fatal or cause disease after birth. They may include aneuploidies, structural abnormalities, or neoplasms.

• Acardiac twin
• Achondrogenesis
• Achondroplasia
• Adrenal hematoma
• Agenesis of the corpus callosum
• Amniotic band syndrome
• Anal atresia
• Anencephaly
• Angelman syndrome
• Aqueductal stenosis
• Arachnoid cyst
• Arthrogryposis
• Bilateral multicystic dysplastic kidneys
• Camptomelic dysplasia
• Cardiac rhabdomyoma
• Caudal regression syndrome
• Chorioangioma
• Cleft palate
• Club foot
• Coarctation of the aorta
• Conjoined twins
• Cyclopia
• Cystic hygroma
• Dandy–Walker malformation
• Diaphragmatic hernia
• Diastrophic dysplasia
• Double outlet right ventricle
• Duodenal atresia
• Ebstein's anomaly
• Ectopia cordis
• Encephalocele
• Endocardial cushion defect
• Esophageal atresia
• Exstrophy of the bladder
• Fetal alcohol syndrome
• First arch syndrome
• Focal femoral hypoplasia
• Gastrointestinal atresia
• Gastroschisis
• Holoprosencephaly
• Hydranencephaly
• Hydronephrosis
• Hydrops fetalis
• Hypoplastic left heart syndrome
• Infantile polycystic kidney disease
• Iniencephaly
• Intracranial teratoma
• Intrauterine growth retardation
• Klippel–Trénaunay syndrome
• Limb body wall complex
• Macrosomia
• Meconium cyst
• Meconium ileus
• Microcephaly
• Multicystic dysplastic kidney
• Multiple pterygium syndrome
• Oligohydramnios
• Omphalocele
• Osteogenesis imperfecta
• Pentalogy of Cantrell
• Polydactyly
• Polyhydramnios
• Posterior urethral valves
• Renal agenesis
• Rh incompatibility
• Sacrococcygeal teratoma
• Spina bifida
• Spinal dysraphism
• Syndactyly
• Tetralogy of Fallot
• Thanatophoric dwarfism
• Transposition of the great vessels
• Triploidy
• Trisomy 13
• Trisomy 18
• Trisomy 21 (Down Syndrome)
• Turner syndrome (Monosomy X)
• Twin-to-twin transfusion syndrome
• Ureterocele
• VACTERL association
• Vein of Galen malformation
• Ventricular septal defect