In zygote intrafallopian transfer a fertilized ovum is placed in the fallopian tube. A single cell can be removed and examined for genetic abnormalities. These are infants born more than 4 weeks early and usually weigh less than 5 pounds. There are numerous causes for prematurity, and numerous potential problems after birth. Aristotle noticed fetal alcohol syndrome.
Cocaine can induce a stroke in the fetus and can cause spontaneous abortion.
Certain viral infections are especially serious during pregnancy. Certain teratogens are found in the workplace. Advances in neonatology is enabling more and more babies, particularly premature babies, to survive. These methods can be classified as hormonal, barrier, behavioral, and surgical. These methods may target the molecular events of fertilization.