Time of exposure: Teratogens are most harmful early in pregnancy, starting
about 10 to 14 days after conception to about 8 weeks into pregnancy
.
At what age is the embryo or fetus less susceptible to teratogens?
The embryonic period, during which organogenesis takes place, occurs between implantation at
around 14 days to around 60 days postconception
. This is usually the most sensitive period to teratogenesis when exposure to a teratogenic agent has the greatest likelihood of producing a malformation.
How are teratogens passed from mother to baby?
Once the fertilized egg is connected to the uterus, a
common blood supply exists between the mother and the embryo
. In other words, if something is in the mother’s blood, it can now cross over to the developing fetus.
What happens if a baby is exposed to teratogens?
Teratogens may affect the embryo or fetus in a number of ways, causing physical malformations,
problems in the behavioral or emotional development of the child
, and decreased intellectual quotient (IQ) in the child.
What is a teratogen and how does it affect prenatal development?
As a baby grows in the womb, teratogens
may affect parts of the baby’s body as they are forming
. For example, the neural tube closes in the first 3 to 5 weeks of the pregnancy. During this time, teratogens can cause neural tube defects such as spina bifida.
What are 2 common teratogens?
Alcohol and smoking
are two common teratogens. Exposure to either of them can lead to developmental anomalies, miscarriage, stillbirth, preterm labor, and a variety of other pregnancy complications.
Is caffeine a teratogen?
In humans,
caffeine does not present any teratogenic risk
. The increased risk of the most common congenital malformations entailed by moderate consumption of caffeine is very slight.
What birth defects can teratogens cause?
During this time, teratogens can cause
neural tube defects such as spina bifida
. Some organs are sensitive to teratogens during the whole pregnancy. This includes the baby’s brain and spinal cord. Alcohol affects the brain and spinal cord, so it can cause harm at any time during pregnancy.
What are the three most common teratogens?
Teratogenic agents include infectious agents (
rubella, cytomegalovirus, varicella, herpes simplex, toxoplasma, syphilis
, etc.); physical agents (ionizing agents, hyperthermia); maternal health factors (diabetes, maternal PKU); environmental chemicals (organic mercury compounds, polychlorinated biphenyl or PCB, …
What are the most critical stages for exposure to alcohol as a teratogen?
The critical period for alcohol teratogenicity was confirmed to be
around the time of conception
. Risk for anatomic abnormalities in the offspring was clearly defined among the 5.6% of infants whose mothers drank more than three ounces of absolute alcohol, that is, more than six drinks, per day.
What are teratogens give 5 examples?
Common teratogens include
some medications, recreational drugs, tobacco products, chemicals, alcohol, certain infections
, and in some cases, uncontrolled health problems in the birthing parent. Alcohol is a well-known teratogen that can cause harmful effects on the fetus after exposure at any time during pregnancy.
What is a common teratogenic cause of mental retardation?
Fetal alcohol syndrome
has an incidence of 1 to 3 in 1000 live births in the United States. It is a major cause of mental retardation and emotional instability.
What is the most common teratogen?
Alcohol
: One of the most commonly used teratogens is alcohol, and because half of all pregnancies in the United States are unplanned, it is recommended that women of child-bearing age take great caution against drinking alcohol when not using birth control or when pregnant (CDC, 2005).
How do you prevent teratogens?
Do not use chemicals that may harm your child
– This includes pesticides, fungicides, rodenticides, or harsh cleaning products. Do not smoke, use drugs or consume alcohol during pregnancy – These teratogens greatly increase the risk of fetal birth defects and other life threatening conditions.
Is stress a teratogen?
Maternal psychological stress has essentially been conceptualized as
a teratogen
, that is, an agent that can generate deleterious perinatal and/or developmental outcomes.
What are the major teratogens during the fetal period?
The central nervous and skeletal systems tend to be most affected by teratogens.
Cigarette components, alcohol, cocaine, warfarin, ACE inhibitors, and Accutane
are all teratogens that affect fetal development.
