https://www.ncbi.nlm.nih.gov/books/NBK132176/

A teratogen is any agent that causes an abnormality following fetal exposure ... with prenatal exposure to alcohol can occur in the first 3 to 8 weeks of pregnancy, ... It is the most common known non-genetic (non-inherited) cause of mental ...

http://www.columbia.edu/itc/hs/medical/humandev/2004/Chpt23-Teratogens.pdf

During the first two weeks of gestation, teratogenic agents usually kill the ... 3. Learn to recognize the most frequent genetic and environmental causes of ...

https://www.stanfordchildrens.org/en/topic/default?id=examples-of-teratogens-90-P02150

There are many different examples of teratogens that cause birth defects. Listed in the directory below are some, for which we have provided a brief overview.

https://www.aboutkidshealth.ca/Article?contentid=341&language=English

Sep 11, 2009 ... This page describes harmful substances, called teratogens, which a woman should ... Therefore, folic acid helps prevent many birth defects, most notably neural tube defects. ... However, these conditions are not very common.

https://embryo.asu.edu/pages/teratogens

Jan 22, 2014 ... Teratogens. ... in his three-volume Traité de Tératologie (Treatise on Teratology). ... The common anomalies were small head circumference, ...

https://chw.org/medical-care/genetics-and-genomics-program/medical-genetics/teratogens

What are the most sensitive periods for teratogens in pregnancy? ... Once the fertilized egg is connected to the uterus, a common blood supply exists between  ...

http://umich.edu/~psycours/350/jaeckelj/terats.htm

Behavioral teratogens---teratogens that tend to harm the prenatal brain, ... when a particular organ or other body part is most susceptible to teratogenic damage.

https://study.com/academy/lesson/teratogen-in-pregnancy-definition-exposure-examples.html

Learn what a teratogen in pregnancy is, relevant time lines during gestation, the most common examples, their effects on developing fetuses, and. ... Finally, about 2-3 weeks after fertilization, the embryo shares a blood supply with the mother.

https://www.healthline.com/health/pregnancy/teratogens

Mar 4, 2016 ... Teratogens are drugs, chemicals, or even infections that can cause abnormal fetal development. ... It isn't always possible to avoid sick children, and in most cases, exposures only lead to minor illnesses. ... 3 sources.

https://www.sciencedirect.com/topics/neuroscience/teratogens

For the most part, teratogens are considered to be chemical agents, such as thalidomide or alcohol. ... There are broadly 3 periods identified in fetal development (see Fig. ... The common embryologic origin of various elements can give rise to ...