Baby Gender Prediction at 15 Weeks
At 15 weeks, gender prediction is becoming increasingly reliable. The genitalia are continuing to develop and a skilled sonographer — or well-trained AI — can often make confident predictions from a good quality scan.
Your Baby at 15 Weeks
- ✦Baby is about 100mm — the size of an apple
- ✦Baby can now hear sounds from outside the womb
- ✦Bones are hardening (ossifying) throughout the body
Gender Prediction Methods at 15 Weeks
Nub Theory
Nub theory remains highly applicable at 15 weeks with accuracy around 85%. The angle of the nub is well-established and clear on most scans.
Skull Theory
Skull theory gives around 75-80% accuracy at 15 weeks. The shape differences are clearly visible in most scan images.
Chinese Gender Calendar
The Chinese Gender Calendar provides an instant result based on conception timing — a fun addition but not as reliable as ultrasound methods.
AI Ultrasound Analysis
Our AI reaches around 85% accuracy at 15 weeks by analysing genital development, nub angle, and skull shape together.
Get Your AI Gender Prediction
Upload your 15-week scan — our AI analyses genitalia development and skull shape for an 85% accurate prediction.
Upload Your 15-Week Scan →Frequently Asked Questions
Can you tell the gender of a baby at 15 weeks?
Yes, with increasing confidence. At 15 weeks, the genitalia are well into their development and most prediction methods achieve 80-85% accuracy.
How accurate is gender prediction at 15 weeks?
Around 85% from AI and nub theory, 75-80% from skull theory. 15 weeks is a solid window for early gender prediction — better than any first trimester attempt.
What does a boy/girl look like on an ultrasound at 15 weeks?
At 15 weeks, a boy's scrotum and penis are clearly developing, while a girl's labia are becoming more defined. On a good quality scan, these differences are often visible.