If you've found yourself scrutinizing those early, first trimester ultrasound images trying to figure out whether you're having a boy or a girl, you're not alone. Many moms (and dads) are asking ChatGPT to take a guess before the doctor or midwife.
"I asked ChatGPT based on nub theory what gender was my baby, and it was able to tell me boy," reports What to Expect Community mom babymamasparks. "I just thought I'd share that in case anyone else wants to try it out!"
"Chat[GPT] told me a boy," says fellow Community mom maegrace0123. "Got blood test results today and it was right — it's a boy!"
Using tech to suss out the sex of your baby-to-be can definitely be fun. But can you actually trust the results — or is it basically a 2026 version of the ring test or the baking soda test? Here's what you should know.
How are moms using AI to find out their baby's sex?
The basic idea goes like this: Share a picture of your first-trimester ultrasound image with AI and ask it to analyze the photo to determine whether you're having a boy or a girl. ChatGPT tends to be the go-to platform, since a lot of parents already use it. But there are also a couple of dedicated apps like AI Ultrasound Photos and NubX that offer the service specifically.
Moms will often ask ChatGPT to use (not always reliable) gender prediction methods like nub theory, skull theory, and Ramzi theory since they can purportedly tell you the sex sooner.
"I tried it last night and it was pretty cool," says What to Expect Community mom rainbowbabe232. "I asked it to analyze the photo based on nub theory, skull theory, and Ramzi theory. Obviously, it's just for fun, but [I] wanted to share since there are a lot of posts on here asking for guesses."
Can AI really tell you your baby's sex?
ChatGPT is pretty up front about the fact that its guesses are just for fun, caveating in its response that it's not 100% conclusive. Dedicated prediction platforms like AI Ultrasound Photos, on the other hand, claim to be able to predict a baby's sex with "high accuracy," while NubX doesn't say how accurate the tool actually is.
What's more, the predictive methods that AI typically relies on themselves have varying accuracy. Nub theory, which predicts a baby's sex based on the angle of a baby-to-be's genital tubercle, is between 70% and 97% accurate. And that's only when done by a trained medical professional, if the ultrasound image offers a just-right view of the baby-to-be's genital structures, says Jonathan Schaffir, M.D., an OB/GYN with the Ohio State University Wexner Medical Center in Gahanna, Ohio.
As for the Ramzi and skull methods? The former claims to predict sex based on the position of your placenta, while the latter makes its guess based on the shape of a baby-to-be's skull. And there's zero evidence showing that either can predict a baby's sex.
Early on pregnancy, it's just too tough to tell based on a sonogram alone: "Our ultrasonographers and maternal-fetal medicine specialists who do ultrasound all day, every day, don't feel confident enough to predict fetal sex at that early, 11- to 14-week period," says Dallas Reed, M.D., an OB/GYN and chief of genetics and genomics at Tufts Medicine in Boston, Massachusetts,. "I don't know how reliable ChatGPT would be."
Since there are only two options to choose from (boy or girl!), any of these tools can be right 50% of the time — hence why some What to Expect Community members have had some success, but just as many have found their AI answer to be off base.
"ChatGPT was wrong for both me and three of my friends' babies — not a single one right," reports What to Expect Community mom Katie0720. "We all uploaded multiple scans asking for Ramzi, nub, and skull [theories] and [it] was still wrong for all of us."
Is AI better at determining baby's sex later on in pregnancy?
Medical professionals can typically tell a baby's sex just by looking at a 20-week ultrasound, but what about ChatGPT? While there's not much research on the topic at this point, Dr. Shaffir guesses that "AI could likely interpret the image."
Of course, you'd be able to get the info straight from your doctor at that point. But if you're on team green, it's possible that (over)eager family or friends with whom you've shared your ultrasound picture might ask AI to guess your baby's sex — and even share the results with others (or accidentally spill the beans — eep!).
Things to know about using AI to predict baby's sex
Even though the answer is a total coin toss, it's fine to use AI to predict your baby's sex for fun — provided you don't mind if it ends up being wrong, say Drs. Schaffir and Reed.
But there are a few things to think about before handing your ultrasound photos over to ChatGPT or another generative AI tool. Your image is, essentially, private medical information that may contain personal details like your name or birth date (unless you crop it out of the picture).
Depending on your AI's privacy policy, the tool you rely on may use your image to train the AI, sell your information to third parties, or repurpose it in other ways, points out Leah Plunkett, a lawyer and a faculty member at Harvard Law School and the author of Sharenthood.
More reliable ways to find out your baby's sex
It's a burning question, so it's totally understandable if you want an answer ASAP. To get one that you can also count on, stick with more accurate prediction methods like:
- Noninvasive prenatal testing (NIPT): This quick blood test, which is typically offered any time after 9 weeks, looks at your baby-to-be's DNA to screen for chromosomal abnormalities — and it can also reveal your baby's sex.
- 20-week ultrasound image: By the time you go in for this routine imaging test, also called an anatomy scan or level-two ultrasound, your baby's genitals will be developed enough for your ultrasound tech to tell whether its a boy or a girl.
- At-home gender prediction test kit: Using just a few drops of your blood, over-the-counter kits like SneakPeek claim to predict baby's sex with up to 99% accuracy as early as 6 weeks. "It just looks for Y chromosome material, which males have," Dr. Reed says. " I don't see any downside to patients using these tests as long as the tests aren't a replacement for NIPT or ultrasound."
ChatGPT and other AI tools can be a fun way to guess your baby-to-be's sex. Just take the results with a grain of salt — and wait until you undergo NIPT or your anatomy scan to decide on a pink or blue nursery.
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