Common Pregnancy Myths Debunked: What Science Really Says

Posted on: Feb 13 2025
By: Vizium360 Marketing

Pregnancy is an exciting time, but it also comes with a flood of advice—some helpful and some based on outdated myths. At Grace Obstetrics & Gynecology in Fort Worth and Granbury, TX, we believe in providing expecting parents with accurate, science-backed information. Let’s debunk some of the most common pregnancy myths so you can navigate this journey with confidence.

Myth #1: You’re Eating for Two

One of the most widespread pregnancy myths is that you need to eat twice as much food. In reality:

During the first trimester, most women don’t need extra calories.
In the second trimester, an additional 300-350 calories per day is recommended.
By the third trimester, you may need about 450 extra calories daily—which is roughly the equivalent of a small meal or snack.

Myth #2: You Can’t Drink Coffee

Caffeine is often linked to pregnancy risks, but moderate consumption is generally safe. The American College of Obstetricians and Gynecologists (ACOG) states that up to 200 mg of caffeine per day (about one 12-ounce cup of coffee) is unlikely to cause harm.

Myth #3: If You Have Heartburn, Your Baby Will Have Lots of Hair

This old wives’ tale has some surprising truth to it! Studies suggest a possible link between pregnancy hormones, heartburn, and fetal hair growth. However, heartburn is primarily caused by hormonal changes that relax the esophageal muscles—not necessarily by how much hair your baby has.

Myth #4: You Should Avoid Exercise

Unless you have a high-risk pregnancy, staying active is encouraged. Regular exercise can:

Improve circulation
Reduce pregnancy discomforts like back pain
Lower the risk of gestational diabetes and excessive weight gain

Always consult your provider to determine which exercises are safe for you.

Myth #5: You Shouldn’t Sleep on Your Back

While prolonged back sleeping in the later stages of pregnancy may reduce blood flow to the baby, occasional back sleeping is not dangerous. If you wake up on your back, simply shift to your side. The best sleeping position is on your left side, which helps optimize blood flow.

Myth #6: Spicy Food Can Induce Labor

There is no scientific evidence that spicy foods, pineapple, or castor oil can naturally induce labor. If you’re near your due date and hoping to speed things up, speak with your provider about safe induction methods.

Myth #7: You Can’t Dye Your Hair While Pregnant

Most hair dyes are safe because very little chemical absorption occurs through the scalp. If you’re concerned, opt for highlights or ammonia-free products and avoid treatments in the first trimester.

Myth #8: The Shape of Your Belly Predicts the Baby’s Gender

Carrying high or low is influenced by factors like muscle tone and fetal position, not gender. The only reliable ways to determine sex are ultrasound, blood tests, or amniocentesis.

Myth #9: Stretch Marks Can Be Prevented with Lotions

Stretch marks are largely genetic. While moisturizers can keep skin hydrated and reduce itchiness, they cannot prevent stretch marks completely. Gaining weight gradually and staying hydrated may help.

Myth #10: You Should Avoid All Seafood

While some fish contain high levels of mercury and should be avoided, low-mercury options like salmon, shrimp, and cod are safe and beneficial. Omega-3 fatty acids in fish support fetal brain development.