You Can’t Get Pregnant During Your Period
Many people are shocked to learn that pregnancy is possible during your period, though the chances are lower. Sperm can survive inside the female reproductive tract for up to five days, according to the American College of Obstetricians and Gynecologists (ACOG). If you have a shorter menstrual cycle, you might ovulate soon after your period ends, and sperm from period sex could still be viable. Recent CDC data highlights that misunderstanding fertility windows is a common cause of unplanned pregnancies. The idea that menstruation is a “safe window” is a persistent myth, even in 2024. Doctors emphasize that while rare, conception during menstruation can and does happen. This is especially true for those with unpredictable cycles.
Heartburn Means Your Baby Will Have Lots of Hair
The old wives’ tale that severe heartburn means your baby will be born with a full head of hair actually has a hint of truth, but it’s not a guarantee. A Johns Hopkins study from 2006 found a slight correlation between heartburn severity and newborn hair. However, the link is not strong enough to predict your baby’s hair growth reliably. Heartburn during pregnancy is mostly caused by hormonal changes that relax the valve between the stomach and esophagus. More recent research in 2023 confirms that heartburn is extremely common, affecting nearly 80% of pregnant women, but most babies are born with little or no hair. So, while it’s a funny coincidence, it’s not a reliable predictor.
Carrying High or Low Reveals Baby’s Gender
The myth that the shape or position of your bump reveals your baby’s gender remains widespread, but there’s no scientific basis for it. Studies reported by the Mayo Clinic confirm that the way you carry depends on your body type, muscle tone, and the position of the baby, not its sex. In 2024, OB-GYNs still debunk this myth in prenatal classes, noting that even experienced mothers can’t accurately guess gender based on belly shape. The only reliable way to identify the baby’s gender is through ultrasound or genetic testing. Many parents are surprised to learn that this myth has zero accuracy, even though it is repeated across cultures. The fascination with bump shapes persists, but it’s just wishful thinking.
You Should Eat for Two
The belief that pregnancy is a license to double your food intake is not only outdated but potentially unhealthy. The CDC and American Pregnancy Association state that most women only need about 300 extra calories per day during pregnancy, and only in the second and third trimesters. Overeating can lead to excessive weight gain, increasing the risk of gestational diabetes and complications. Recent 2025 guidelines stress the importance of balanced nutrition rather than increased quantity. Nutritionists encourage focusing on nutrient-dense foods instead of simply eating more. The “eat for two” myth is still common, but experts warn against following it literally. Most women are surprised by how modest the actual calorie increase should be.
Morning Sickness Only Happens in the Morning
Despite the name, “morning sickness” can strike at any time of day or night. The National Institutes of Health (NIH) reports that up to 80% of pregnant women experience nausea, often peaking in the morning but also appearing in the afternoon, evening, or even waking women up at night. In 2024, the term “morning sickness” is considered misleading by many healthcare providers. There is no clear-cut time frame for these symptoms, and the intensity varies widely. Some women may feel ill all day, while others have only brief moments of queasiness. The misconception persists, but nausea is an unpredictable companion for many expectant mothers.
Pregnant Women Can’t Exercise
It’s a common misconception that exercise is unsafe during pregnancy, but research consistently shows the opposite. A 2023 review in the British Journal of Sports Medicine concluded that moderate exercise improves pregnancy outcomes and reduces risks such as gestational diabetes. The ACOG recommends at least 150 minutes of moderate-intensity aerobic activity each week for most pregnant women, unless there are complications. Activities like walking, swimming, and prenatal yoga are considered safe and beneficial. Exercise can also help manage weight, mood, and sleep quality. Modern guidelines emphasize individualizing activity, but warn against complete inactivity unless medically necessary.
You Can’t Dye Your Hair While Pregnant
Many women fear that hair dye will harm their unborn baby, but the evidence says otherwise. Studies reviewed by the American College of Obstetricians and Gynecologists in 2024 found no increased risk of birth defects from hair dye chemicals when used as directed. Most dyes contain low levels of potentially harmful substances, and only minimal amounts are absorbed through the skin. Experts recommend waiting until after the first trimester as a precaution, but occasional hair coloring is generally considered safe. The myth persists due to lingering concerns about chemical exposure, but the science is reassuring. Pregnant people can feel confident about maintaining their hair color routine.
Spicy Food Will Trigger Labor
The idea that eating spicy food will send you into labor is a persistent myth, but there’s no clinical evidence behind it. Extensive studies, including a 2023 review by the American Journal of Obstetrics & Gynecology, found no significant link between spicy food and the onset of labor. Labor is triggered by complex hormonal changes, not by what you eat. While spicy foods might cause heartburn or digestive upset, they don’t influence contractions or cervical dilation. Many women nearing their due date still try this trick, only to find no effect. Healthcare professionals agree that this myth is wishful thinking more than scientific fact.
Stretch Marks Can Be Prevented With Creams
Despite the shelves of creams promising to prevent stretch marks, recent dermatology studies, including a 2024 review in JAMA Dermatology, show that genetics play the biggest role in whether you’ll develop them. Moisturizers can help relieve itching as the skin stretches, but no cream has been proven to stop stretch marks completely. Some ingredients, such as hyaluronic acid or cocoa butter, may help with skin hydration, but they don’t change the underlying process. Most women will develop some stretch marks during pregnancy, regardless of product use. The myth persists because everyone is eager for a simple solution, but the evidence is clear: prevention is mostly out of your hands.
You Should Avoid All Seafood
Pregnant women are often told to avoid seafood entirely, but this is an oversimplification. The FDA and EPA updated their guidelines in 2024, emphasizing the benefits of eating certain types of fish rich in omega-3 fatty acids, which are vital for fetal brain development. Low-mercury options like salmon, sardines, and shrimp are not only safe but encouraged, with a recommended intake of 2–3 servings per week. The real concern is with high-mercury fish, such as shark, swordfish, and king mackerel. Avoiding all seafood can mean missing out on key nutrients. Modern recommendations focus on balance, not complete avoidance.
Pregnant Women Shouldn’t Drink Coffee
The myth that all caffeine is off-limits during pregnancy is not supported by current research. According to a 2023 study from the American Journal of Obstetrics and Gynecology, moderate caffeine intake—about 200 milligrams per day, or roughly one 12-ounce cup of coffee—is considered safe for most pregnant women. Excessive caffeine can increase the risk of miscarriage or low birth weight, but moderate consumption has not been linked to adverse outcomes. Many women unnecessarily give up their morning coffee based on outdated advice. The key is moderation, not total abstinence, and new guidelines reflect this balanced approach.