How early can you find out if you are having a boy or girl?

Fun methods can be tried before pregnancy even starts, but the earliest medically reliable answer is a NIPT blood test from about 10 weeks. The anatomy ultrasound usually confirms sex at the 18 to 20 week scan, and nub theory can give a decent early guess from 12 to 14 weeks.

How accurate is the 12 week scan for gender?

A 12 week look at the genital tubercle, the nub theory method, agrees with the later scan roughly 70 to 90 percent of the time on a clear image and is easier for girls. It is a good early guess but not a confirmation.

What is the earliest blood test for baby gender?

Cell-free DNA NIPT, available from around 10 weeks, detects male Y-chromosome material and reports sex with better than 99 percent accuracy where disclosure is permitted.

Can the anatomy ultrasound get the gender wrong?

Rarely, but yes. Accuracy is about 95 to 99 percent and depends on the baby's position, and very occasionally a swollen labia is misread as male or an umbilical cord hides the view. A doubtful scan is usually re-checked.

When Can You Find Out Your Baby's Gender?

The honest week-by-week answer depends entirely on how you look. Fun guesses can start before you conceive; the earliest reliable answer is a blood test at about 10 weeks; and the standard confirmation is the 18 to 20 week anatomy scan. Use the calculator to see where you are right now.

Quick Answer

10 weeks — NIPT blood test (>99%, the earliest reliable answer). 12–14 weeks — nub theory (a good guess). 18–20 weeks — anatomy scan (95–99%, the usual reveal). Diagnostic CVS (10–13) and amnio (15–20) are ~99%+ but only done for medical reasons. Every no-equipment method works anytime but only ever guesses.

Gender-Discovery Countdown

Enter your due date or your first day of your last period and we will work out your current gestational week plus how long to each milestone.

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The Full Timeline

Weeks	What you can try	Accuracy	Type
Any / before	Chinese chart, symptoms quiz	~50%	Entertainment
6–8	Ramzi theory	~50%	Unproven scan
~10	NIPT blood test	>99%	Validated
10–13	CVS (medical only)	~99%+	Diagnostic
12–14	Nub theory	70–90%	Early guess
15–20	Amniocentesis (medical only)	~99%+	Diagnostic
18–20	Anatomy ultrasound	95–99%	Validated
20+	Confirmed, or at birth	100%	Fact

10 Weeks: The Earliest Reliable Answer (NIPT)

A cell-free DNA blood test, often taken with your first-trimester screening, looks for male Y-chromosome material in your blood. Where local law allows sex disclosure, it reports gender with better than 99% accuracy from about 10 weeks — earlier than any ultrasound can be trusted.

12–14 Weeks: Nub Theory (Best Early Guess)

Before the anatomy scan, the genital tubercle angle is the most meaningful ultrasound clue. Read the full nub guide for the angle method and honest accuracy.

18–20 Weeks: The Anatomy Scan (Standard Reveal)

The mid-pregnancy scan shows the genitals directly and is the moment most parents finally learn. Position matters — a baby with crossed legs can hide the view — but accuracy is 95–99%.

What If You Do Not Want to Know?

Some parents keep it a surprise. Every method here is optional, and you can simply enjoy the guess for fun and find out at birth. Our reveal ideas work great for a surprise, too.

Fun Methods You Can Try Today

Can't wait for 10 weeks? These cost nothing and add to the excitement (at coin-flip accuracy): the Chinese gender chart, the boy-or-girl symptom quiz, baking soda, ring test and skull theory — all combined in one place on the main predictor.

Frequently Asked Questions

How early can you find out the sex?

Medically, NIPT from about 10 weeks. The anatomy scan confirms at 18–20 weeks, and nub theory gives an early guess at 12–14.

How accurate is the 12-week scan?

The nub method agrees with the later scan roughly 70–90% on a clear image, easier for girls — a good guess, not a confirmation.

Earliest blood test for gender?

Cell-free DNA NIPT from ~10 weeks, >99% where disclosure is legal.

Can the anatomy scan be wrong?

Rarely. It's 95–99%; position, the cord, or swollen labia can cause an occasional misread that gets re-checked.

Sources & Further Reading

Noninvasive prenatal testing, Wikipedia

Sex determination, Wikipedia

Reviewed by the Gender Predictor team · Updated September 11, 2026 · Gestational math is an estimate; follow your provider's dating. Not medical advice.

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