What could cause stillbirth at second trimestre? by Connie b. Dellobuono

Answer by Connie b. Dellobuono:

From my sr midwives:
Fetus whose brain and nervous system is not complete tend to be born stillbirth. Mothers who have used medications/drugs during the first trimester tend to have stillbirths.
From Wiki:
The causes of a large percentage of human stillbirths remain unknown, even in cases where extensive testing and autopsy have been performed. A rarely used term to describe these is "sudden antenatal death syndrome" or SADS, a phrase coined by Cacciatore & Collins in 2000.[4] Many stillbirths occur at full term to apparently healthy mothers, and a postmortem evaluation reveals a cause of death in only about 40% of autopsied cases.[5]
In cases where the cause is known, some possibilities of the cause of death are:
bacterial infection
birth defects, especially pulmonary hypoplasia
chromosomal aberrations
growth retardation
Induced Fetal Demise
intrahepatic cholestasis of pregnancy
maternal diabetes
high blood pressure, including preeclampsia
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[6]
female genital mutilation[7]
Entanglement of cord in twin pregnancy at the time of Caesarean Sectionumbilical cord accidents[8]

What could cause stillbirth at second trimestre?