Baby Gender Prediction at 17 Weeks
By 17 weeks, the genitalia are well-developed and gender prediction is highly reliable. Most parents who want an early gender reveal choose this window for their scan.
Your Baby at 17 Weeks
- ✦Baby is about 130mm — the size of a pear
- ✦Fat is beginning to develop under the skin
- ✦Baby's skeleton is changing from cartilage to bone
Gender Prediction Methods at 17 Weeks
Nub Theory
At 17 weeks, the nub has evolved into clearly differentiated genitalia. Direct observation is now more relevant than nub theory, with ~90% accuracy.
Skull Theory
Skull theory continues to give around 80% accuracy at 17 weeks and can supplement direct genital observation.
Chinese Gender Calendar
The Chinese Gender Calendar remains a popular cultural method — especially in Asian families — though it's less accurate than ultrasound techniques.
AI Ultrasound Analysis
AI analysis at 17 weeks reaches around 88-90% accuracy by examining the now-visible external genitalia alongside skull and body position markers.
Get Your AI Gender Prediction
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Upload Your 17-Week Scan →Frequently Asked Questions
Can you tell the gender of a baby at 17 weeks?
Absolutely — 17 weeks is a reliable time to predict gender. The external genitalia are clearly developing and most methods achieve 85-90% accuracy.
How accurate is gender prediction at 17 weeks?
Around 88-90% from AI and direct genital observation, 80% from skull theory. 17 weeks is an excellent time for a confident early prediction.
What does a boy/girl look like on an ultrasound at 17 weeks?
At 17 weeks, male genitalia is clearly visible — the scrotum, penis, and testes (which are descending) are all developing. Female genitalia shows well-defined labia.