Pregnancy acne is not a reliable indicator that you are carrying a girl. The idea has deep roots in folk wisdom, but the scientific evidence connecting breakouts to fetal sex is thin. One small hospital study from Taiwan did find a statistical association between carrying a female fetus and more facial acne in the second and third trimesters, yet the study followed only 35 women, far too few to serve as a basis for prediction. The real drivers of pregnancy acne are hormonal shifts that happen regardless of whether the baby is a boy or a girl.
Where the Myth Comes From
The saying “a girl steals your beauty” is one of the oldest pregnancy folk beliefs in many cultures around the world. The logic goes like this: a female fetus supposedly draws estrogen away from the mother, leaving her with dull skin, acne, and limp hair. A male fetus, by contrast, is said to give the mother a “glow.” Versions of this belief appear across Europe, the Middle East, South Asia, and the Americas, and it is still common enough that pregnant people search for it in large numbers.
When researchers have actually tested these kinds of folk predictions, they tend to fall apart. A study that surveyed mothers about a range of old wives’ tales found no meaningful differences between women who had boys versus girls on nearly every measure, including skin changes, food cravings, and belly shape. The single exception was self-reported hair glossiness, which was slightly more common among women carrying boys, the opposite direction from the folklore about girls “stealing beauty.”1Hrčak / Southeastern European Medical Journal. He or She, What Will It Be: Old Wivesʹ Tales and Foetal Sex Prediction
The One Study That Found a Link
It would be misleading to say there is zero published evidence, because one prospective study did report a connection. Researchers at a hospital in Taiwan tracked inflammatory facial acne in 35 pregnant women and found that carrying a female baby and being pregnant for the first time were both associated with higher acne counts during the second and third trimesters.2PubMed. Inflammatory facial acne during uncomplicated pregnancy and post-partum in adult women: a preliminary hospital-based prospective observational study of 35 cases from Taiwan The authors themselves labeled the work “preliminary,” and the sample size makes it impossible to draw confident conclusions. A study of 35 people can easily pick up patterns that vanish in a larger group. No larger follow-up study has confirmed the finding, so it sits in the literature as an interesting observation rather than an established fact.
This matters because many online articles cite this study as though it settles the question. It does not. When a single small study reports a finding and nobody else replicates it, the responsible reading is that the question remains open, leaning heavily toward “probably no meaningful connection.”
Why Pregnancy Acne Actually Happens
To understand why the fetal-sex theory is unlikely, it helps to know what causes breakouts during pregnancy in the first place. The main culprit is the dramatic rise in progesterone. Progesterone levels climb steadily throughout pregnancy, peaking in the third trimester. This hormone stimulates the sebaceous glands to produce more oil, and the extra sebum can clog pores and feed the bacteria that trigger inflammatory acne. Estrogen levels also surge, and while estrogen tends to improve skin in some contexts, the combination of rising estrogen and progesterone creates a hormonal environment where acne-prone skin often gets worse.
These hormonal surges are driven primarily by the placenta and the mother’s own endocrine system, not by the fetus. The placenta begins producing large quantities of progesterone and estrogen by the second trimester regardless of fetal sex. That is why acne can strike during any pregnancy, boy or girl.
Do Hormones Actually Differ by Fetal Sex?
There are real, measurable hormonal differences depending on fetal sex, but they do not line up neatly with what you would expect if the folk theory were correct. A study measuring maternal testosterone throughout pregnancy found that women carrying boys had gradually rising testosterone levels, while women carrying girls saw testosterone decline after the first trimester. By the second half of pregnancy, the difference was statistically significant.3The Journal of Steroid Biochemistry and Molecular Biology. Maternal testosterone and fetal sex Since testosterone is one of the hormones that ramps up sebum production, this finding would actually predict more acne in boy pregnancies, not girl pregnancies.
Research on immune markers tells a more complicated story. A study comparing maternal blood samples across 38 pregnancies found that carrying a boy was associated with higher levels of several pro-inflammatory cytokines, while carrying a girl was associated with higher levels of certain regulatory cytokines. Interestingly, levels of sex hormones in maternal blood did not differ by fetal sex at all.4PubMed Central. Fetal Sex-Based Differences in Maternal Hormones, Angiogenic Factors, and Immune Mediators During Pregnancy and the Postpartum Period So the immune environment does shift slightly depending on fetal sex, but the hormones most directly linked to acne, like testosterone, estrogen, and progesterone, either do not differ or trend in the wrong direction for the myth.
A Symptom That Does Skew Toward Girls
If you are looking for a pregnancy symptom that has a real, replicated statistical connection to fetal sex, severe morning sickness is a better candidate than acne. Hyperemesis gravidarum, the extreme form of nausea and vomiting that sometimes requires hospitalization, has been linked to a modestly higher chance of carrying a girl in multiple studies. A systematic review and meta-analysis covering thousands of pregnancies found that women with hyperemesis gravidarum were about 27 percent more likely to deliver a female baby.5PubMed. Consequences of hyperemesis gravidarum for offspring: a systematic review and meta-analysis A separate analysis estimated that severe nausea in the first two months was associated with roughly a seven-percentage-point increase in the proportion of girl births.6PubMed. An adaptive significance of morning sickness? Trivers-Willard and Hyperemesis Gravidarum
Even this connection, which is among the best-documented of all pregnancy symptom–fetal sex associations, is far too weak to use as a prediction tool. A 27 percent increase in odds still means plenty of women with severe nausea deliver boys, and plenty of women with easy pregnancies deliver girls. The associations are population-level patterns, not individual-level predictors. So even the strongest symptom-based signal is more of a statistical curiosity than something you could rely on at your next ultrasound appointment.
Other Skin Changes During Pregnancy
Acne is just one of many skin changes that can show up during pregnancy, and most of them are hormonally driven in ways that have nothing to do with whether the baby is a boy or a girl. Melasma, the dark patches that sometimes appear on the forehead, cheeks, and upper lip, is triggered by rising levels of estrogen, progesterone, and melanocyte-stimulating hormone, all of which increase sharply in the third trimester.7Anais Brasileiros de Dermatologia. Melasma: a clinical and epidemiological review The linea nigra, the dark line that runs down the abdomen, develops through the same pigmentation mechanism. Stretch marks, spider veins, and changes in mole appearance are all common, too.
None of these changes have been reliably linked to fetal sex. They happen because pregnancy floods the body with hormones at levels it has never experienced before, and different tissues respond in different ways. If you are breaking out, darkening, or stretching, it says more about your own hormone sensitivity and skin type than about what is happening with the baby.
The Role of Stress
One factor that does not get enough attention in conversations about pregnancy acne is stress. Pregnancy is a time of heightened emotional and physical demands, and stress has a well-documented relationship with inflammatory skin conditions, including acne. Stress activates the body’s cortisol response, and when cortisol stays elevated, it can worsen inflammation in the skin and increase oil production.8International Journal of Drug Delivery Technology. Psychological Stress and Cortisol Levels in Skin Inflammation This means that the stress of pregnancy itself, sleep disruption, body changes, work pressures, anxiety about the baby, can contribute to breakouts in a way that has absolutely nothing to do with fetal sex.
If your acne worsened around the same time your stress levels spiked, the cortisol pathway is a more plausible explanation than the sex of the baby. And unlike fetal sex, stress is something you can actually address with sleep hygiene, support, and, if needed, help from a mental health professional.
How Fetal Sex Is Actually Determined
If you genuinely want to know whether you are having a boy or a girl, the only reliable methods are medical ones. A standard anatomy ultrasound, typically performed around 18 to 20 weeks, can identify fetal sex with high accuracy in experienced hands. For earlier and even more precise results, non-invasive prenatal testing (NIPT), which analyzes fragments of fetal DNA circulating in the mother’s blood, can determine sex as early as the first trimester. A meta-analysis of NIPT studies covering more than 11,000 tests found sensitivity above 98 percent and specificity above 99 percent for fetal sex determination.9PubMed. The accuracy of cell-free fetal DNA-based non-invasive prenatal testing in singleton pregnancies: a systematic review and bivariate meta-analysis Some centers have begun piloting NIPT as early as six to nine weeks of gestation with promising concordance rates.10PubMed Central. Early Non-Invasive Prenatal Testing at 6–9 Weeks of Gestation
Compared to looking at breakouts, belly shape, or food cravings, these tests give you an actual answer. The folk methods are fun to speculate about, and some people genuinely enjoy playing the guessing game, but when accuracy matters, the technology is there.
Treating Acne Safely During Pregnancy
Regardless of whether the baby is a boy or a girl, you may want to manage your breakouts. The challenge is that several go-to acne treatments are off-limits during pregnancy. Oral retinoids like isotretinoin are well-known teratogens and are absolutely contraindicated. Tetracycline antibiotics are also avoided because of risks to fetal bone and tooth development. Hormonal therapies like spironolactone are not used during pregnancy either.
That still leaves a reasonable toolkit. Dermatology guidelines recommend topical treatments as first-line options during pregnancy:
- Azelaic acid: considered one of the safest choices, with anti-inflammatory and antibacterial properties.
- Benzoyl peroxide: widely used and generally regarded as low-risk in pregnancy.
- Topical antibiotics: erythromycin and clindamycin applied to the skin are standard recommendations.
- Salicylic acid: low-concentration topical forms are typically considered acceptable.
For more severe cases, oral macrolide antibiotics like erythromycin or azithromycin, as well as cephalexin, may be considered as second-line treatments. Light-based therapy using blue-violet or red light has also been suggested as an adjunct option.11PubMed. Treatment of acne vulgaris during pregnancy and lactation A 2024 review in the American Journal of Clinical Dermatology largely echoed these recommendations, emphasizing that providers and patients have a reasonable range of options even with the restrictions pregnancy imposes.12PubMed. Management of Acne in Pregnancy
One area that has been a source of confusion is topical retinoids. While oral retinoids are clearly dangerous during pregnancy, the evidence on topical retinoids has been less certain. A large Nordic cohort study compared over 2,000 infants exposed to topical retinoids during pregnancy with unexposed infants and found no increased risk of major congenital malformations.13PubMed. Topical retinoid use in women of reproductive age and risk of major congenital malformations in exposed pregnancies: a Nordic cohort study That said, most guidelines still recommend avoiding topical retinoids during pregnancy out of an abundance of caution, and plenty of effective alternatives exist. If you were using a retinoid before you found out you were pregnant, the data should be reassuring, but it is worth switching to a different product going forward.
Pre-Existing Conditions That Affect Pregnancy Acne
Your baseline skin and hormonal profile before pregnancy matter more than fetal sex when it comes to predicting breakouts. People with a history of hormonal acne, particularly those who experienced flares around their menstrual cycle, are more likely to develop or worsen acne during pregnancy. Conditions involving elevated androgens can also set the stage for more pronounced pregnancy acne, since the hormonal shifts of pregnancy layer on top of an already androgen-sensitive baseline.
If you had clear skin before pregnancy and are suddenly breaking out, the pregnancy hormones themselves are the likeliest cause. If you had acne-prone skin before and it is getting worse, the pregnancy is amplifying an existing tendency. In neither case does the baby’s sex offer a useful explanation. Your own hormonal landscape, genetics, and skin type are doing the heavy lifting.
Why Folk Beliefs Feel So Convincing
It is worth understanding why the acne-means-a-girl belief persists despite the lack of evidence. The main reason is confirmation bias. Roughly half of all babies are girls, and a large percentage of pregnant people experience some degree of acne. When both things happen in the same pregnancy, the brain naturally links them into a story. When someone breaks out and delivers a boy, the prediction is quietly forgotten. When someone breaks out and delivers a girl, the story gets told at baby showers for years.
Social media amplifies this effect. Posts about gender prediction myths get shared widely, and the ones where the prediction “worked” attract the most engagement. Nobody screenshots their wrong guess. The result is a curated feed where the myth appears to work far more often than it actually does, reinforcing a belief that careful research has repeatedly failed to support.