Alcohol-Related Birth Defects
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Remember those “Miracle of Life” movies they showed in high school health class to explain the stages of human development? However much you rolled your eyes or slept through them at the time, the title isn’t an exaggeration — life is a miracle. It’s mind-boggling if you think about it: somehow, a tiny cell divides and grows into a complex cluster that continues to divide and differentiate, eventually becoming, well, you!
Another key fact those videos drilled into us from an early age is that pregnancy is a no-drinking zone. No matter what your next-door neighbor or great aunt said was true “back in the day,” there’s no wiggle room here. Alcohol-related birth defects are a sad reality of drinking during pregnancy. Let’s find out more about how they develop and how to prevent them!
According to the CDC, drinking during pregnancy isn’t safe. This simple statement is crucially important to understand. Alcohol can affect the fetus at any stage, including the time we don’t even know we’re pregnant yet — before that missed period, the home pregnancy test, and the 3-minute wait for the telltale line to appear (or not). (For an in-depth look, check out our blog “What Are the Risks of Drinking Alcohol While Pregnant?”)
So what’s the connection between pregnancy, alcohol, and birth defects? Let’s take an overall view of the stages of fetal development and see what role alcohol plays in each one. (Spoiler alert: while the exact effects and their severity may vary, the answer is the same — there is no known safe amount of alcohol during pregnancy at any developmental stage.)
All in all, at each stage, there’s potential harm that can cause developmental delays further down the line. This harm is dose-dependent, but both moderate drinking over time and single instances of binge drinking can cause damage.
How exactly does the alcohol (or any other substance for that matter) get from mom to baby during the fetal stage? It all has to do with the placenta — a unique organ that forms in the womb and sustains the fetus throughout pregnancy.
The placenta acts as a multipurpose house, food delivery system, oxygen-providing service, and waste-removal system all in one. It’s connected to the growing fetus by a tube-like umbilical cord, which later falls off leaving an ever-present reminder — the belly button.
In addition to nourishing the fetus, the placenta passes on some of the substances in the mother’s bloodstream, including alcohol. The placenta’s permeability can cause birth defects from alcohol.
Now, let’s look in more detail at the range of problems that can develop in the different stages of pregnancy.
Some of the main physical abnormalities that can happen as a result of drinking during pregnancy are grouped together as “alcohol-related birth defects,” or ARBD. Unlike other types of abnormalities related to alcohol use during pregnancy, they are mostly physical in nature and can occur at any point, although they are more likely to be more severe if they happen in the embryonic stage. Let’s examine how alcohol use might affect different organs.
Did you know that the fetal heart starts beating as early as three weeks after fertilization? That’s right, in less than a month the tiny group of cells that will form the basis of our heart muscle is already pumping away — and will continue to do so for the rest of our life.
Alcohol can disrupt the delicate process of fetal heart development and lead to congenital heart defects. Both involve the formation of a small hole between heart chambers known as a septal defect:
It’s important to note that while alcohol can cause these defects, these defects can also happen with no alcohol. Both septal defects are diagnosed through an echocardiogram, which takes a detailed picture of the heart and records its functions. To get a more detailed look, a doctor might perform a bubble study, which involves injecting tiny microbubbles into our veins and tracking them with an ultrasound device to pinpoint the hole’s location.
Luckily, both ASD and VSD are sometimes minor enough that they either heal by themselves or don’t cause too many problems. In other instances, however, they need surgical correction.
Kidneys start to develop early in the embryonic stage and are fully formed by the end of the first trimester. Drinking alcohol at any point during their development can lead to potential abnormalities:
Like heart abnormalities, problems with the kidneys are often treatable. Still, many might require surgery or other complex procedures.
Developing bones are not immune to alcohol’s effects, either. Problems can include limb and spine abnormalities:
While bone problems are often not life-threatening and treatments are available, they can certainly impact quality of life.
Finally, the sensory organs also can suffer as a result of exposure to alcohol:
Once again, these problems might not be life-threatening, but they can greatly impact a child’s life.
Aside from ARBD, other birth defects can develop as a result of alcohol exposure during pregnancy. Let’s take a look.
Unlike ARBD, ARND isn’t marked by physical disabilities. Instead, the damages happen largely behind the scenes in the brain and can show up later as cognitive and behavioral issues. Here’s the gist:
While ARND isn’t entirely treatable, it’s manageable with the right support. Early intervention is crucial — getting a diagnosis might be emotionally difficult, but at this point, it’s all about fixing what’s fixable. It’s important to get help as soon as possible!
Finally, there’s the most serious alcohol-related set of issues, known as fetal alcohol syndrome. A group of alcohol-related birth defects that include physical and mental problems, FASD is a spectrum of disorders ranging from mild to severe.
According to Birthdefects.org, symptoms include several physical abnormalities:
Like other alcohol-related birth defects, it’s entirely avoidable if we stay away from alcohol when we’re pregnant and, ideally, during the time when we think pregnancy is on the horizon. Unfortunately, it’s largely untreatable once it develops, although special educational services and psychological support can provide some help.
While alcohol-related birth defects are difficult to treat after they develop, the truth — both heartbreaking and encouraging — is that they’re highly preventable. Here’s what you can do:
With these tips, you and your baby will be off to a safe start.
In the end, pregnancy is a special, challenging, and exciting time, but adding alcohol to the mix can bring on a unique set of dangers and long-lasting effects. Let’s avoid alcohol-related birth defects by staying informed, avoiding alcohol, and taking care of our body and mind (and our baby’s!) during pregnancy and beyond!
1. What exactly are Alcohol-Related Birth Defects (ARBD)?
ARBD refers to physical defects in a baby that occur due to the mother's alcohol consumption during pregnancy. These defects can affect various parts of the body, including the heart, kidneys, bones, and sensory organs like the eyes and ears. Unlike other conditions related to alcohol exposure in utero, ARBD focuses specifically on physical abnormalities.
2. Can drinking at any stage of pregnancy cause ARBD?
Yes, drinking alcohol at any stage of pregnancy can lead to alcohol-related birth defects. The risk and type of birth defects may vary depending on the timing of alcohol exposure. The first trimester is especially critical because that’s when the baby’s organs are forming, but the entire pregnancy is crucial for healthy development.
3. Is there any safe amount of alcohol to drink during pregnancy?
No, there is no safe amount of alcohol to consume during pregnancy. Alcohol can cross the placenta and harm the developing fetus, leading to ARBD and other conditions. The safest choice for the health of the baby is to abstain from alcohol entirely during pregnancy.
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