Does Pregnancy Hair Growth Predict Your Baby's Sex?

Many pregnant people notice their hair changing during pregnancy, growing faster, feeling thicker or looking shinier than usual. The old wives tale says that thick, fast-growing hair signals a boy, while thinning or dull hair points to a girl. As with most pregnancy folklore, the story is appealing but the science tells a different story about what is really happening.

The traditional belief

According to the myth, a male pregnancy keeps the mother hormones in balance and enhances her beauty, including thicker and faster-growing hair. A female pregnancy is said to do the opposite, leaving hair limp or thin. This belief overlaps with the unkind idea that a daughter steals her mother beauty. It remains popular at UK baby showers despite lacking any scientific foundation.

What actually causes hair changes in pregnancy

During pregnancy, oestrogen levels rise significantly, which extends the growing phase of the hair cycle and reduces normal shedding. This is why many pregnant people feel their hair is thicker, regardless of baby sex. The effect is purely hormonal and affects people carrying both boys and girls. After birth, hormone levels drop and the shed hair catches up, causing noticeable postpartum hair loss.

Is there any evidence linking hair growth to sex?

No studies have found a meaningful association between pregnancy hair changes and fetal sex. The thickness and growth rate of hair are driven by maternal hormones, genetics and nutrition, not by whether the baby is male or female. The myth survives because the 50 percent chance of a correct guess is high enough to keep stories alive.

Other factors that influence hair in pregnancy

Your pre-pregnancy hair type, thyroid function, iron levels, diet and hair care routine all affect how your hair looks during pregnancy. Someone with naturally thick hair may not notice much change, while someone with fine hair might see a dramatic difference. None of these factors indicate whether you are carrying a boy or girl.

Body hair changes too

Some pregnant people also notice increased body hair on the face, arms or abdomen due to higher androgen levels. This is normal and usually fades after birth. If the hair growth is sudden or excessive, mention it to your midwife, as it can occasionally signal conditions such as polycystic ovary syndrome or thyroid imbalance, though it is not a gender predictor.

Trusting reliable methods over myths

If you want to know your baby sex, turn to methods backed by science. Nub theory at 12 weeks, SneakPeek, NIPT and private gender scans all offer far more dependable answers than the state of your hair. Enjoy the pregnancy hair while it lasts, but do not treat it as a crystal ball for gender.

Frequently Asked Questions

Does thicker pregnancy hair mean you are having a boy?

No. Hair thickness is caused by high oestrogen extending the growth phase. It is not linked to baby sex.

Why does hair fall out after pregnancy?

After birth, hormone levels drop and the hair that stayed in the growth phase during pregnancy sheds, causing temporary postpartum hair loss.

Is extra body hair in pregnancy normal?

Mild increases are normal due to higher androgens. Sudden or excessive growth should be mentioned to your midwife to rule out thyroid or other issues.

This article is for informational purposes only and does not constitute medical advice. Always consult your midwife or healthcare provider for guidance specific to your pregnancy.