Can Astrology Predict Baby Gender? An In-Depth Look

Determining the sex of a baby before birth has long fascinated expectant parents. While modern medical technology like ultrasounds can provide this information, some look to more mystical methods like astrology for clues about their future child’s gender.

In this post, we’ll take an in-depth look at the astrological techniques used for predicting baby gender and evaluate how accurate they really are.

A Brief History of Astrological Gender Prediction

Attempting to foresee a child’s sex based on the positions of the stars and planets is an ancient practice dating back thousands of years. In many cultures, astrologers would cast horoscopes and analyze the mother’s birth chart for indications of the baby’s likely gender.

Certain planets and zodiac signs were thought to be more associated with masculine or feminine energy. For example, a predominance of fiery planets like Mars or the zodiac sign Aries in the mother’s chart was believed to signify a boy. On the other hand, an abundance of Venus energy or the sign Taurus was seen as pointing to a girl.

Over the centuries, astrologers developed more complex techniques for gender prediction taking into account the mother’s age, conception date, lunar phases, and other celestial factors. While not scientifically proven, these astrological methods have persisted as alternates to modern medical gender testing.

Common Astrological Gender Prediction Techniques

Today, many astrologers continue advising expectant parents on the likelihood of their baby’s sex based on astrological techniques. Some of the most common approaches include:

Chinese Gender Chart – This ancient chart maps the mother’s age at conception and month of conception to predict if the baby will be a boy or girl. Supposedly based on I Ching principles, it claims over 90% accuracy but has been debunked by scientists.

Lunar Phases – The moon’s phases at the time of conception and during pregnancy are said to influence gender. A full moon is thought to indicate a girl while a new moon favors a boy. However, studies show lunar effects on sex determination are negligible.

Venus and Mars Positions – Relative positions of Venus and Mars in the zodiac at conception are analyzed, with Mars dominant seen as a boy sign and Venus as a girl indicator. But research gives no evidence for planets impacting gender this way.

Numerology – Adding digits of the mother’s birth date, ages of parents, and conception date is used to derive a number indicator for boy or girl based on odd/even status. Numerology cannot scientifically determine gender.

Zodiac Signs – Certain zodiac signs associated with masculine (Aries, Gemini, Leo, Libra, Aquarius, Sagittarius) or feminine (Taurus, Cancer, Virgo, Scorpio, Capricorn, Pisces) energy may be seen as influencing gender likelihood. No credible research supports this.

Moon Signs – Comparing moon signs of parents is thought to signal baby gender, with same signs indicating a girl and different signs for a boy. However, a child’s gender is not determined by parental moon signs.

Evaluating the Accuracy of Astrological Gender Predictions

While astrological methods for predicting baby gender have a long history, they do not have a strong track record of accuracy when evaluated scientifically. Many studies have tested the validity of lunar phase, planetary position, Chinese gender chart, and zodiac sign techniques and found no significant correlation between these factors and a child’s sex.

For instance, an analysis of over 300 births found the Chinese gender chart was accurate only about 51% of the time – no better than random chance. Other investigations have revealed similar lack of evidence for astrological gender predictions being any more reliable than flipping a coin.

The main reasons astrology falls short on determining sex before birth are:

  • Human conception and gender development are complex biological processes unaffected by astronomical events.
  • There are too many variables astrology fails to account for like genetics, hormones, age, environment, etc.
  • Vague astrological parameters can be interpreted in different ways with inconsistent predictions.
  • Reported successes of gender predictions tend to highlight positive hits and ignore misses.

While astrology can offer some entertainment value to curious parents, its predictive validity and scientific basis are poor. For accurate sex determination before birth, medical techniques like ultrasound and prenatal DNA testing are far more reliable.

Alternative Baby Gender Predictors

Beyond astrology, various less scientific folk methods for guessing baby gender have also been used over the years. These include:

  • Morning sickness – Severe morning sickness associated with girls, mild with boys (no evidence supports this).
  • Skin changes – Soft, clear skin means a girl vs rough, acne prone for boy (another myth).
  • Ring test – Suspending mom’s wedding ring over her belly predicting boy or girl (complete unfounded).
  • Baking soda test – Mixing parental urine with baking soda to assess foaming as gender indicator (not scientifically backed).
  • Fetal heart rate – Higher heart rate (over 140 bpm) indicating girl vs lower for boy (may have slight accuracy).
  • Skull theory – Assessing fetal skull shape on ultrasound for clues about gender (no medical validity).
  • Carrying high or low – Belief that carrying baby high means girl and low means boy (an inaccurate old wives’ tale).

Like astrology, these alternative gender predictors have no real scientific validity or reliability. For parents set on knowing their baby’s sex before birth, ultrasound and DNA tests remain the only accurate options. Consulting an experienced obstetrician is always recommended over unproven folk methods.


Curiosity about a baby’s gender is natural for expecting parents. However, astrology and many folk beliefs do not provide reliable ways to predict sex before birth despite enduring popularity. While entertained as harmless fun by some, these methods have no grounding in science or medicine.

Those seeking accurate early gender determination are best advised to stick with proven medical technology and consult their healthcare provider. In the end, the experience of welcoming a healthy baby eclipses any gendered preconceptions suggested by the stars or other dubious signs.


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Morton-Pradhan, S., Bay, R. C., & Coonrod, D. V. (2005). Birth rate and its correlation with the lunar cycle and specific atmospheric conditions. American Journal of Obstetrics and Gynecology, 192(6), 1970–1973.

Stupnikov, S. N., Chistyakova, G. N., & Rogoza, R. T. (2015). Fetal heart rate and prediction of the sex of fetus. Bulletin of Experimental Biology and Medicine, 160(1), 117-120.

Vonberg, R. W. (2005). Impact of the lunar cycle on deliveries and the influence of prior theory on practice. American Journal of Obstetrics and Gynecology, 192(5), 1586–1588.

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