For years, health experts have given a simple message about alcohol and pregnancy: there is no known safe amount of alcohol during pregnancy.

Yet one question continues to worry many people, especially those who may not know they are pregnant during the earliest weeks:

Can an occasional drink really make a difference?

New research published in September 2026 in the journal Nutrients adds to growing evidence that alcohol exposure during early pregnancy may be linked to a higher risk of miscarriage, even at relatively low levels of drinking.

The findings don’t mean that having one drink automatically causes a miscarriage. They also cannot prove that alcohol directly caused every pregnancy loss in the study.

But they do reinforce an important message: the safest choice during pregnancy is to avoid alcohol.

What the New Study Found

Researchers from Erasmus MC University Medical Center in Rotterdam analyzed data from more than 3,200 women and their partners participating in the Generation R Next Study.

They looked at alcohol consumption before conception as well as during early pregnancy and examined how it related to fertility and pregnancy outcomes.

One of the most important findings was that alcohol consumption during early pregnancy was associated with a higher risk of miscarriage.

Interestingly, the study also found that women who reported drinking small amounts of alcohol before becoming pregnant appeared to have lower odds of infertility.

At first glance, that might seem confusing.

Could light drinking somehow improve fertility?

The researchers strongly cautioned against interpreting the results that way.

In other words, the study does not show that alcohol improves fertility.

There were important differences between women who drank and those who did not. Women who consumed moderate amounts of alcohol in this population were more likely to have higher education levels, higher socioeconomic status, and other lifestyle characteristics that could influence fertility.

Some people who completely avoid alcohol may also do so because of existing health conditions or previous alcohol-related problems.

These differences can create misleading statistical associations.

So while the fertility finding may sound surprising, it should not be interpreted as a reason to drink alcohol when trying to conceive.

The picture becomes much clearer when looking at alcohol consumption after conception.

The Numbers Behind Alcohol and Miscarriage Risk

Previous research has also found a connection between alcohol exposure during early pregnancy and miscarriage risk.

According to research from Vanderbilt University Medical Center, each week a woman consumed alcohol during approximately the first five to ten weeks of pregnancy was associated with an additional 8% increase in miscarriage risk.

The association continued through around the ninth week.

Importantly, the researchers found that the increase was seen across different levels of reported alcohol consumption, including women who reported fewer than one drink per week as well as those reporting more than four drinks per week.

The association also did not appear to depend on the particular type of alcoholic beverage consumed.

This is one reason researchers and health organizations are cautious about trying to define a specific “safe” amount of alcohol during pregnancy.

Rather than identifying a level that is guaranteed to be harmless, the evidence suggests that avoiding alcohol altogether is the safest approach.

Why the First Weeks of Pregnancy Matter So Much

One of the biggest challenges is that pregnancy often isn’t recognized immediately.

Many women don’t confirm that they are pregnant until approximately four to six weeks into pregnancy, often after a missed period.

By then, important developmental processes have already begun.

Alcohol consumed by a pregnant woman enters her bloodstream and can cross to the developing fetus.

The developing baby’s body cannot process alcohol as efficiently as an adult’s body. The fetal liver is still developing, which means alcohol can remain in the baby’s system for longer.

This matters because the earliest weeks of pregnancy are a period of rapid development.

The placenta is developing.

Organs are beginning to form.

The nervous system is developing.

The embryo is undergoing a series of complex biological changes that depend on carefully coordinated signals and adequate nutrition.

Research suggests that alcohol may interfere with some of these processes by affecting maternal and fetal metabolism and potentially reducing the availability of nutrients needed for healthy development.

This is particularly important because someone may drink during this period without knowing that they are pregnant.

Alcohol Can Affect More Than Miscarriage

Miscarriage isn’t the only concern associated with alcohol exposure during pregnancy.

According to the CDC, alcohol use during pregnancy is associated with risks including miscarriage, preterm birth, stillbirth, and other serious complications.

Alcohol exposure can also affect fetal development throughout pregnancy.

One of the most important concerns is fetal alcohol spectrum disorders (FASDs).

FASDs are a group of conditions that can occur when a developing baby is exposed to alcohol before birth.

The effects can vary widely.

Some children may experience difficulties with learning, attention, memory, behavior, or problem-solving. Others may have physical or developmental problems.

The most severe condition within the spectrum is fetal alcohol syndrome (FAS), which can involve problems affecting the central nervous system, growth, and certain facial features.

Because the developing brain continues changing throughout pregnancy, there isn’t a point at which alcohol suddenly becomes completely safe.

What About Binge Drinking?

The amount and pattern of drinking can also matter.

Binge drinking exposes the body to a large amount of alcohol over a relatively short period and can result in particularly high alcohol levels in the bloodstream.

Research has identified binge drinking during pregnancy as an important concern.

One reason this is especially relevant is that many pregnancies aren’t recognized during the first few weeks.

Someone may therefore engage in drinking—including occasional heavy drinking—before discovering that they are pregnant.

That doesn’t mean someone who drank before realizing they were pregnant should automatically assume that something has gone wrong.

It means that once pregnancy is known, avoiding further alcohol exposure is the safest choice.

Why Researchers Need to Be Careful With These Findings

The 2026 Nutrients study provides useful information, but like other observational studies, it has limitations.

Researchers cannot simply look at two groups and conclude that one factor directly caused an outcome.

For example, alcohol consumption was based partly on information reported by participants and their partners.

People may not always remember exactly how much they drank.

They may also unintentionally report less alcohol than they actually consumed.

This is particularly possible when discussing a behavior that people may feel embarrassed or judged about.

Another limitation involves very early pregnancy losses.

Some pregnancies end before a person even realizes they are pregnant.

Those very early losses may not always be recorded as miscarriages. Instead, they could be classified as a failure to conceive.

If that happened, some pregnancy losses may have been missed when researchers analyzed the data.

That means the study’s findings need to be interpreted carefully.

Why the Fertility Finding Can Be Misleading

The apparent link between light drinking before conception and lower infertility risk is a good example of why observational research can sometimes be misunderstood.

Women who drank moderate amounts in this particular population tended to have several characteristics that were also associated with better health outcomes.

They were more likely to have higher levels of education and socioeconomic status and, on average, lower body mass index.

Meanwhile, some people who completely abstain from alcohol may have health conditions that influenced their decision not to drink.

This creates what researchers sometimes call “sick quitter” bias.

In simple terms, people who stop drinking because of an existing health problem may end up in the non-drinking group. If those health problems also affect fertility, the non-drinking group may appear less healthy for reasons that have nothing to do with alcohol itself.

That’s why the researchers did not interpret the fertility association as evidence that alcohol improves reproductive health.

The message for people trying to conceive remains much simpler: there is no reason to start drinking alcohol in an attempt to improve fertility.

What If You Drank Before You Knew You Were Pregnant?

This is perhaps the most important practical question.

Pregnancy isn’t always immediately obvious.

A person may have a drink at a restaurant, attend a celebration, or have a glass of wine with dinner before realizing that they are pregnant.

If this happened to you, there is no reason to automatically assume that you will have a miscarriage or that your baby will definitely have a health problem.

The research does not show that one drink guarantees a negative outcome.

Individual pregnancies are different, and observational research cannot predict what will happen to one specific pregnancy.

The important step is what you do after discovering the pregnancy.

If you learn that you are pregnant, stop drinking alcohol and speak with your healthcare provider if you are concerned about previous exposure.

Stopping alcohol at any point prevents additional exposure.

What Health Authorities Recommend

The CDC’s guidance is clear: there is no known safe amount of alcohol during pregnancy, no known safe time during pregnancy to drink alcohol, and no type of alcohol known to be safer than another.

The CDC also recommends avoiding alcohol when trying to become pregnant.

This guidance isn’t based on the idea that every small exposure will cause harm.

Instead, it reflects the fact that researchers have not been able to establish an amount that can confidently be called safe for every pregnancy.

That’s an important distinction.

The new research doesn’t prove that every small amount of alcohol will result in miscarriage.

Rather, it adds to existing evidence suggesting that alcohol exposure during early pregnancy may increase the risk of pregnancy loss.

The Bottom Line

The new study shouldn’t be interpreted as saying that one drink will cause a miscarriage.

That’s not what the research proves.

Instead, it adds to a larger body of evidence showing why alcohol and pregnancy are treated cautiously by health professionals.

The earliest weeks of pregnancy are particularly important because major developmental changes are already taking place, sometimes before a woman knows she is pregnant.

For someone who is pregnant or trying to conceive, avoiding alcohol is the safest option.

And for someone who drank before discovering the pregnancy, the most important thing is not to panic.

Stop drinking once pregnancy is recognized and talk with a qualified healthcare professional if you have concerns.

Pregnancy can be an anxious time, especially when you worry that something you did before knowing you were pregnant may have caused harm.

But one past drink does not tell you what the outcome of your pregnancy will be.

The goal is simply to reduce further exposure and get appropriate medical guidance.

The research has not identified a guaranteed “safe” amount of alcohol during pregnancy. That’s why health authorities recommend avoiding it altogether.

Disclaimer:

The information provided in this article is for general informational and educational purposes only. It is based on publicly available research and reputable health information sources and is not intended to provide medical advice, diagnosis, or treatment. Every pregnancy is different. If you are pregnant, trying to conceive, or concerned about alcohol exposure during pregnancy, speak with a licensed physician, obstetrician, midwife, or other qualified healthcare professional. Do not delay or avoid professional medical care because of information presented in this article.

Note: All images used in this article are AI-generated and intended for illustrative purposes only.