As of 2016, there is no international classification system for<unk>  causes. The causes of a large percentage of<unk> s is unknown, even in cases where extensive testing and an autopsy have been performed. A rarely used term to describe these is "sudden antenatal death syndrome", or SADS, a phrase coined in 2000. Many<unk> s occur at full term to apparently healthy mothers, and a postmortem evaluation reveals a cause of death in about 40% of autopsied cases. About 10% of cases are believed to be due to obesity, high blood pressure, or diabetes. Other risk factors include: *bacterial infection, like syphilis *malaria *birth defects, especially pulmonary hypoplasia *chromosomal aberrations *growth restriction *intrahepatic cholestasis of pregnancy *maternal diabetes *maternal consumption of recreational drugs (such as alcohol, nicotine, etc.) or pharmaceutical drugs contraindicated in pregnancy *postdate pregnancy *placental abruptions *physical trauma *radiation poisoning *Rh disease *celiac disease *female genital mutilation Entanglement of cord in twin pregnancy at the time of Caesarean Section *umbilical cord accidents *Prolapsed umbilical cord – Prolapse of the umbilical cord happens when the fetus is not in a correct position in the pelvis. Membranes rupture and the cord is pushed out through the cervix. When the fetus pushes on the cervix, the cord is compressed and blocks blood and oxygen flow to the fetus. The mother has approximately 10 minutes to get to a doctor before there is any harm done to the fetus. *Monoamniotic twins – These twins share the same placenta and the same amniotic sac and therefore can interfere with each other's umbilical cords. When entanglement of the cords is detected, it is highly recommended to deliver the fetuses as early as 31 weeks. *Umbilical cord length - A short umbilical cord (72 cm) can affect the fetus depending on the way the fetus interacts with the cord. Some fetuses grasp the umbilical cord but it is yet unknown as to whether a fetus is strong enough to compress and stop blood flow through the cord. Also, an active fetus, one that frequently repositions itself in the uterus can accidentally entangle itself with the cord. A hyperactive fetus should be evaluated with ultrasound to rule out cord entanglement. *Cord entanglement - The umbilical cord can wrap around an extremity, the body or the neck of the fetus. When the cord is wrapped around the neck of the fetus, it is called a nuchal cord. These entanglements can cause constriction of blood flow to the fetus. These entanglements can be visualized with ultrasound. *Torsion – This term refers to the twisting of the umbilical around itself. Torsion of the umbilical cord is very common (especially in equine<unk> s) but it is not a natural state of the umbilical cord. The umbilical cord can be untwisted at delivery. The average cord has 3 twists. A pregnant woman sleeping on her back after 28 weeks of pregnancy may be a risk factor for<unk> . After a<unk>  there is a 2.5% risk of another<unk>  in the next pregnancy (an increase from 0.4%). In the United States, highest rates of<unk> s happen in pregnant women who: * are of low socioeconomic status * are aged 35 years or older * have chronic medical conditions such as diabetes, high blood pressure, high cholesterol, etc. * are African-American * have previously lost a child during pregnancy * have multiple children at a time (twins, triplets, etc.)
Stillbirth
Childbirth
Birch
Birth injury
Multiple birth
Breech birth
Low Birth Weight
Coffin birth