When I was pregnant, I tried every single one of these with both of my pregnancies. The ring test, the Chinese calendar, the heart rate theory. All of it. And both times, I was convinced I was having a girl. (Spoiler: I have two boys.) So take all of this with a giant grain of salt and enjoy it for what it is.
That said, there's something deeply human about wanting to know. Before ultrasounds and NIPT tests, this is all people had. (Between wondering if the crops would fail or if they would survive the winter. Good old days, baby!)
Here's a full rundown of the most popular old wives' tales, what they claim, and whether any of them hold up.
Bump Shape & Size
The tale: Carrying low and out front like a basketball? Boy. Carrying high or spread wide? Girl.
This is probably the one the office manager, Barb, will announce the second she sees your belly. The problem is that how you carry has a lot more to do with your core strength, body shape, and the baby's position than it does with sex. First-time moms tend to carry higher because their abdominal muscles are tighter. So this one is really just a fun conversation starter.
Morning Sickness
The tale: Brutal nausea and vomiting = girl. Sailing through the first trimester = boy.
There is some evidence that hyperemesis gravidarum (severe morning sickness) is slightly more common in pregnancies carrying girls, possibly linked to higher levels of hCG. But plenty of people have easy pregnancies with girls and miserable ones with boys. If you're in the thick of it right now, I'm sorry, but it doesn't necessarily mean anything about who's in there.
Heart Rate
The tale: Baby's heart rate above 140 bpm = girl. Below 140 bpm = boy.
This one comes up at almost every prenatal appointment. Fetal heart rate does vary, but it's more influenced by how active the baby is and how far along you are than by sex. A 2006 study published in Fetal Diagnosis and Therapy found no significant difference in heart rates between male and female fetuses in the first trimester. Still a fun one to track though.
Cravings
The tale: Reaching for ice cream and chocolate? Girl. Can't stop thinking about burgers and chips? Boy.
I craved salt and vinegar chips nonstop with both pregnancies, so clearly the "salty = boy" tale had something going for it in my case, but that's anecdote, not data. Cravings are most likely driven by nutritional needs, hormones, and what sounds good when everything else is making you nauseous.
Skin & Hair Changes
The tale: Glowing skin = boy. Breakouts, dull skin, or thinning hair = girl (because she's "stealing your beauty").
First of all, I find the idea that a daughter is stealing your beauty extremely rude. It always feels like a salty mother in law came up with it. Second, skin changes during pregnancy are driven by hormonal shifts that happen regardless of the baby's sex. That said, some research suggests girls may be associated with slightly higher estrogen levels, which could affect skin, but the "glow" or lack thereof is really just pregnancy doing its thing.
Gut Feeling
The tale: You just have that gut feeling that you know what you're having.
Some studies have suggested that mothers' intuition about their baby's sex is correct around 70% of the time, which is better than chance. Whether that's biology, unconscious cue reading, or just a good guess remains unclear. But if you have a strong feeling, it's worth paying attention to. I was convinced both times, and right only once, so your mileage may vary.
The Ring or Pendulum Test
The tale: Hang your wedding ring (or a needle) on a piece of thread over your belly. Circles = girl. Back and forth = boy. (This varies by tradition, so don't @ me.)
This one is pure fun. There's no science behind it, but it's a staple at baby showers and a great way to get everyone involved. (I think it works best with a slightly drunk aunt.) The movement is likely caused by unconscious micro-movements in your hand — called the ideomotor effect — not mystical forces.
The Chinese Gender Prediction Calendar
The tale: Using the mother's lunar age at conception and the lunar month of conception, a chart predicts boy or girl. Claims up to 93% accuracy in some versions.
This one has been around for centuries and is genuinely fascinating from a cultural history standpoint. Studies testing its accuracy have found it performs at about 50/50. So, basically a coin flip. It's still fun.
Partner Clues
The tale: If your partner is gaining weight along with you, you're having a girl.
This one's actually rooted in a real phenomenon called couvade syndrome, where partners experience sympathetic pregnancy symptoms including weight gain, nausea, and mood changes. It's fascinating, but it has nothing to do with the baby's sex. Just a partner who's very emotionally invested (bless them).
The Math-Based Tales
The tale: The Mayan method looks at the mother's age at conception and the year of conception. If both are even or both are odd, girl. One of each, boy. There are also various number-adding tricks floating around online.
These are essentially numerology applied to pregnancy, which means they're exactly as accurate as you'd expect. But they're genuinely fun to calculate at a gender reveal party, so here we are.
The Weird Ones
(Garlic Test, Key Test, and Other Oddities) Eat garlic and if the smell seeps through your pores, it's a boy. Pick up a key from the narrow end and it's a girl, the round end and it's a boy.
I'm including these purely because they're wonderfully unhinged. There's no logic, no science, no through-line, just generations of people looking at a key and thinking this will tell me something.
So What Does Science Say?
Most of these tales perform at right around 50/50. Which makes sense because there are only two options.
The methods with the most legitimate scientific discussion behind them are:
- Morning sickness severity (some weak correlation with female pregnancies)
- Maternal intuition (surprisingly decent track record in some studies)
- Fetal heart rate (varies, but not reliably by sex)
If you actually want to know before birth, your real options are:
- NIPT (non-invasive prenatal testing): Can detect fetal sex from around 10 weeks via a blood draw
- Anatomy ultrasound: Usually done around 18 - 20 weeks
- Amniocentesis or CVS: More invasive, typically done for medical reasons
The Bottom Line
These old wives' tales have been passed down for generations because pregnancy makes us curious, impatient, and a little superstitious, and there's nothing wrong with that. Have fun with them. Just don't paint the nursery based on the ring test.
Did any of these work for you? Drop your experience in the comments. I'd love to know which tales were right (or spectacularly wrong).
Also check out: What Color Eyes Will My Baby Have? Baby Eye Color Predictor
Leave a Comment