development. Alcohol is a teratogen (causes birth defects) and there is no known safe amount of alcohol to consume while pregnant and there is no known safe time during pregnancy to consume alcohol to prevent birth defects such as FASD. Evidence of harm from low levels of alcohol consumption is not clear and since there are not known safe amounts of alcohol, women are suggested to completely abstain from drinking when trying to get pregnant and while pregnant. Small amounts of alcohol may not cause an abnormal appearance, however, small amounts of alcohol consumption while pregnant may cause milder symptoms such as behavioral problems and also increases the risk of miscarriage. Among those women who are alcoholic, an estimated one-third of their children have FAS. Fetal Alcohol Syndrome occurs when a fetus is exposed to alcohol during conception. Although traditionally believed through the mother who is pregnant woman has more than four standard drinks per day. There is evidence supporting the father before conception can cause FAS through long term epigenetic mutation of the father's sperm as well during conception. Mechanism Despite intense research efforts, the exact mechanism for the development of FAS or FASD is unknown. On the contrary, clinical and animal studies have identified a broad spectrum of pathways through which maternal alcohol can negatively affect the outcome of a pregnancy. Clear conclusions with universal validity are difficult to draw, since different ethnic groups show considerable genetic polymorphism for the hepatic enzymes responsible for ethanol detoxification. Genetic examinations have revealed a continuum of long-lasting molecular effects that are not only timing specific but are also dosage specific; with even moderate amounts being able to cause alterations. A human fetus appears to be at triple risk from maternal alcohol consumption: The placenta allows free entry of ethanol and toxic metabolites like acetaldehyde into the fetal compartment. The so-called placental barrier is practically absent with respect to ethanol. The developing fetal nervous system appears particularly sensitive to ethanol toxicity. The latter interferes with proliferation, differentiation, neuronal migration, axonic outgrowth, integration, and fine-tuning of the synaptic network. In short, all major processes in the developing central nervous system appear compromised. Fetal tissues are quite different from adult tissues in function and purpose. For example, the main detoxicating organ in adults is the liver, whereas the fetal liver is incapable of detoxifying ethanol, as the ADH and ALDH enzymes have not yet