Is It a Boy or Girl? 15 Old Wives' Tales vs What Science Says

RevealTogether TeamJanuary 17, 2026
8 min read
Is It a Boy or Girl? 15 Old Wives' Tales vs What Science Says

Boy or Girl? 15 Old Wives' Tales Put to the Test (Plus What Actually Works)

Long before ultrasounds existed, expectant families relied on folklore, intuition, and creative tests to predict their baby's gender. While we now have medical science to tell us for certain, these old wives' tales remain a beloved part of pregnancy traditions—and a fun way to engage guests at gender reveal parties!

Let's examine 15 popular gender prediction myths, see what science actually says about each, and discover how to turn them into entertaining party activities.

Why We Love Gender Prediction Games

Gender prediction games have endured for centuries because they tap into our natural curiosity and desire for connection. They're:

  • Fun and engaging - Everyone loves to guess!
  • Conversation starters - Great for baby showers and reveals
  • Family bonding - Grandparents often share stories of predictions from their pregnancies
  • Harmless entertainment - No pressure, just fun
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Turn these myths into a party activity! Have guests vote on their predictions before your reveal. RevealTogether includes interactive voting so everyone can participate in the guessing game before the big moment.

The Old Wives' Tales: What They Claim vs. Reality

1. The Ring Test

The Myth: Tie your wedding ring to a string and hold it over your belly. If it swings in circles, it's a girl. If it swings back and forth, it's a boy.
How It Works: The idea is that the baby's "energy" or the mother's subconscious movements influence the ring's motion.
Science Says:No evidence whatsoever

The ring's movement is caused by tiny involuntary movements in your hand (ideomotor effect)—the same phenomenon behind Ouija boards and dowsing rods. The baby's sex has no influence.

Fun Factor: ⭐⭐⭐⭐⭐ (Great party activity!)

2. Carrying High vs. Low

The Myth: Carrying high means a girl; carrying low means a boy.
How It Works: Visual observation of the pregnant belly's position.
Science Says:Completely determined by other factors

How you "carry" is determined by:

  • Your muscle tone and body type
  • The baby's position
  • Whether this is your first pregnancy
  • Your core strength

None of these relate to the baby's sex.

Fun Factor: ⭐⭐⭐ (Easy to discuss but not interactive)

3. Food Cravings (Sweet vs. Salty)

The Myth: Craving sweets means you're having a girl. Craving salty or sour foods means a boy.
How It Works: The theory suggests different hormones from male vs. female fetuses cause different cravings.
Science Says:No correlation found

Studies show no consistent pattern between cravings and baby's sex. Cravings are more likely influenced by:

  • Nutritional needs
  • Hormonal changes (not gender-specific)
  • Cultural food preferences
  • Individual metabolism
Fun Factor: ⭐⭐⭐⭐ (Fun to compare cravings!)

4. Morning Sickness Severity

The Myth: Severe morning sickness (hyperemesis gravidarum) means you're having a girl.
How It Works: The theory suggests female fetuses produce more hCG, causing worse nausea.
Science Says: ⚠️ Some weak evidence

A few studies have found a slight correlation between severe morning sickness and female babies. One Swedish study found women hospitalized for hyperemesis were slightly more likely to have girls (56% vs. 44%). However, this is far from reliable for prediction.

Fun Factor: ⭐⭐ (Not fun if you're suffering!)

5. Baby's Heart Rate

The Myth: A heart rate above 140 BPM means girl; below 140 means boy.
How It Works: The idea is that female hearts beat faster.
Science Says:Thoroughly debunked

Multiple studies have found no significant difference in fetal heart rates between boys and girls. Heart rate varies based on:

  • Gestational age
  • Baby's activity level
  • Time of measurement
  • Baby's health

A 2006 study of over 10,000 pregnancies found no correlation.

Fun Factor: ⭐⭐⭐ (Easy to check if you have records)

6. Chinese Gender Calendar

The Myth: An ancient Chinese chart can predict gender based on the mother's age at conception and the month of conception.
How It Works: Cross-reference your lunar age with the lunar month of conception on a chart allegedly from ancient China.
Science Says:50/50 odds (same as guessing)

Studies have tested this calendar against actual birth records and found accuracy rates of 50%—exactly what you'd expect from random chance. The "ancient" origins are also disputed.

Fun Factor: ⭐⭐⭐⭐ (Fun to calculate, easy activity)

7. Skin Changes (Acne = Girl)

The Myth: If pregnancy gives you acne, you're having a girl who's "stealing your beauty."
How It Works: The theory suggests female hormones from a girl baby cause skin problems.
Science Says:No evidence

Pregnancy acne is caused by increased hormones—from YOUR body, not the baby's. Hormone fluctuations affect everyone differently regardless of baby's sex.

Fun Factor: ⭐⭐ (Can be sensitive topic)

8. Mayan Gender Predictor

The Myth: If both the mother's age at conception AND the year of conception are even or both are odd, it's a girl. If one is even and one is odd, it's a boy.
How It Works: Simple math based on numbers.
Science Says:Pure coincidence (50% accuracy)

This is essentially a coin flip dressed up as ancient wisdom. No biological mechanism could connect these numbers to sex determination.

Fun Factor: ⭐⭐⭐ (Quick and easy to calculate)

9. Mother's Intuition

The Myth: A mother just "knows" what she's having.
How It Works: Maternal instinct or subconscious body awareness.
Science Says: ⚠️ Mixed results

Interestingly, some studies show mothers guess correctly slightly more than 50% of the time—around 55-70% in some research. However, this could be influenced by:

  • Confirmation bias
  • Cultural expectations
  • Dreams
  • Subtle physical cues

Not reliable enough for certainty, but not entirely random either!

Fun Factor: ⭐⭐⭐⭐ (Always interesting to hear mom's guess)

10. Hair Growth

The Myth: If your leg hair is growing faster during pregnancy, it's a boy.
How It Works: Male hormones from a boy baby supposedly increase hair growth.
Science Says:Individual hormone variation

Pregnancy hormones affect hair growth differently for everyone. Some women experience faster growth, some slower, some thicker hair—regardless of baby's sex.

Fun Factor: ⭐⭐ (Awkward to discuss publicly)

11. Baking Soda Test

The Myth: Add urine to baking soda. If it fizzes, it's a boy. If nothing happens, it's a girl.
How It Works: The theory is that a male baby's hormones make urine more acidic.
Science Says:Measures hydration and diet, not baby's sex

The fizzing reaction depends on the acidity of your urine, which is influenced by:

  • How much water you've drunk
  • What you've eaten
  • Time of day
  • Kidney function

None of this relates to baby's sex.

Fun Factor: ⭐⭐⭐ (Interactive, but messy!)

12. Garlic Test

The Myth: Eat garlic. If you smell like garlic afterward, it's a boy. If you don't smell, it's a girl.
How It Works: Supposedly girls make you process garlic differently.
Science Says:No evidence whatsoever

How your body processes garlic depends on your own metabolism, gut bacteria, and sweat glands—not your baby's sex.

Fun Factor: ⭐ (Socially questionable to test!)

13. Key Test

The Myth: Put a key in front of a pregnant woman. If she picks it up by the narrow end, it's a girl. By the round end, it's a boy.
How It Works: Subconscious preference supposedly reveals baby's sex.
Science Says:Completely random

How you pick up a key depends on the key's position, your hand dominance, and random chance. Zero biological connection.

Fun Factor: ⭐⭐⭐⭐ (Easy, fun party trick)

14. Breast Size Changes

The Myth: If your right breast becomes larger, it's a boy. Left breast larger means girl.
How It Works: Unknown—perhaps related to the side the baby favors?
Science Says: ⚠️ One small study suggests possible link

One Polish study found a slight correlation between larger right breast and male babies, but the study was small and hasn't been replicated. Most doctors consider this unreliable.

Fun Factor: ⭐⭐ (Private observation)

15. Dad's Weight Gain

The Myth: If dad gains weight during pregnancy (sympathetic pregnancy), it's a girl.
How It Works: Perhaps responding to "female energy"?
Science Says:No evidence

Couvade syndrome (sympathetic pregnancy symptoms in fathers) happens with both boys and girls equally. Dad's weight gain relates to lifestyle changes, stress eating, or eating what mom craves—not baby's sex.

Fun Factor: ⭐⭐⭐ (Fun to tease dad!)

What ACTUALLY Predicts Baby's Gender?

If old wives' tales are unreliable, what actually works?

Medical Methods (Actually Accurate)

MethodAccuracyWhen Available
NIPT Blood Test99%+10+ weeks
Ultrasound95-99%18-22 weeks
Amniocentesis99.9%15-20 weeks
CVS99.9%10-13 weeks

Timeline Summary

  • 10 weeks: NIPT blood test available
  • 14-16 weeks: Some skilled ultrasound techs can guess
  • 18-22 weeks: Anatomy scan (most common way to find out)
  • Birth: 100% accurate (obviously!)
⚠️

Never rely on old wives' tales for any important decisions. They're entertainment only! For accurate gender determination, consult your healthcare provider.

Turn It Into a Party Game!

These myths make perfect gender reveal party activities. Here's how:

Prediction Station Setup

Create a "voting station" where guests can:

  1. Review each myth
  2. Make their predictions based on the "evidence"
  3. Cast their final vote (Team Boy or Team Girl)
  4. Compare results after the reveal!

Scoreboard Fun

Track which old wives' tales "correctly" predicted your baby's gender. It's fun to see which random myth happened to get it right!

Interactive Voting

Want to make it even more engaging? RevealTogether includes live voting where all guests—in person AND virtual—can submit their predictions before the synchronized reveal. Everyone sees the vote totals right before the big moment!
What makes it special:
  • Real-time vote counting
  • Virtual guests can participate equally
  • Results displayed before the reveal
  • Captures the excitement of collective guessing

The Verdict: Fun, Not Fact

Old wives' tales are:

  • ✅ Entertaining party activities
  • ✅ Conversation starters
  • ✅ Cultural traditions worth sharing
  • ❌ Reliable gender predictors
  • ❌ Scientific methods

Enjoy them for what they are—a fun way to celebrate the mystery and excitement of pregnancy. Just don't paint the nursery based on what a swinging ring tells you!


Ready for the Real Reveal?

After all the guessing games, it's time for the moment of truth!

Plan your reveal:
Make it interactive:
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Want your guests to vote on their predictions before the big reveal? RevealTogether lets everyone—near and far—cast their guess and see the group's predictions before the synchronized reveal moment. See how it works →

Ready to Create Your Special Moment?

Turn the excitement into action. Create a beautiful, shareable gender reveal experience for your friends and family.