Difficult labor (dystocia) Difficult labor, also known as
dystocia or obstructed labor, occurs when the child cannot easily pass through the
birth canal. This can result in
fetal distress or physical trauma to the child, especially broken clavicles and
damage to the brachial plexus nerves. It can also deprive the child of
oxygen as the umbilical cord is pinched, potentially causing
brain damage or death. Difficult labor may occur because the baby is abnormally large (
macrosomia), because the mother's pelvis or birth canal is small or deformed, or because the baby is in an
abnormal presentation for the birth (such as
breech or transverse presentation).
External causes Fetal malformations and birth injuries may occur as a result of exposure to
environmental toxins such as
mercury or
lead. Many medications can also affect the development of the fetus, as can alcohol, tobacco, and illicit drugs. Birth injuries may also occur during delivery and labor, in some cases as a result of
medical malpractice.
Genetic mutations Genetic
mutations can cause a wide variety of fetal malformations, ranging from relatively mild
cleft lips to severe and even fatal deformities.
Infection Maternal infection may be transmitted to the fetus; this is called a
vertically transmitted infection. The fetus has a weak immune system, so infections that are relatively minor in adults can be serious in a developing fetus. In addition, some studies suggest that maternal infections increase the risk of
neurodevelopmental disorders, including
schizophrenia, in the child.
Intrauterine hypoxia Intrauterine hypoxia, or oxygen deprivation in the womb, can cause serious brain damage in the fetus. It most commonly occurs because of damage to or malformation of the
umbilical cord or
placenta. Intrauterine hypoxia can cause brain damage, including
cerebral palsy and other neurological and psychiatric disorders.
Maternal health issues Certain maternal health issues can cause birth injuries.
Gestational diabetes can cause
premature birth,
macrosomia, or
stillbirth.
Pregnancy complications Complications such as
placenta previa,
placental abruption,
placenta accreta,
retained placenta,
placental insufficiency,
placental infarcts,
anemia, and
preeclampsia can limit the supply of oxygen and nutrients to the fetus, increasing the risk of birth defects. Severe cases may be fatal to the fetus. ==Common types of birth injury==