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A baby's sex is determined by two chromosomes the "x" and the "y" females are naturally "xx" and a male is "xy" the males sperm is made up of many "x" and "y" chromosomes thus making the male responsible for the sex of the child

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12y ago
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13y ago

You can probably see the sex of the fetus by three months. By then organs are already developed. However it is not easy to tell on some babies.

With an ultrasound, you can probably not detect the sex of yore baby until sometime between week 16-20. An ultrasound is, after the 20th week of pregnancy, generally more than 90% accurate at being able to tell a baby's sex.

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12y ago

Grab it by the legs and hold it downside-up. Pull the legs as far apart as possible and look at the place where the legs come together.

If you see a ridiculous pouch with something resembling a worm hanging over it, it's probably male.

If you see a ridiculous slit with flaps, it's probablyfemale.

If you see a combination of these two things, it's probably a hermaphrodite.

When you are done ascertaining the baby's gender you can go ahead and drop it on the floor. You should probably wash your hands, too. Good luck!

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13y ago

The sperm from the father can supply either an X-bearing or a Y-bearing chromosome. The egg from the mother can only supply an X-bearing chromosome. An XY combination produces a boy baby. An XX combination produces a girl baby. It might seem that the father therefore determines the sex of the baby, but some recent evidence suggests that the mother can select either an X-bearing or a Y-bearing sperm. See the Wikipedia article on "Maternal influence on sex determination." (Thanks to Faasp for the answer to a similar question)

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14y ago

Between 16 - 20 weeks. Your doctor will probably want to do the ultrasound right around 20 weeks to make sure the gender is obvious.

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6y ago

The most accurate time is between 18-22 weeks. Anything before 18 weeks is more of a guess, and anything after 22 weeks the baby might be too big to see between the knees.

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14y ago

ultra souunds -- see your doctor.

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13y ago

It's all in the sperms.

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15y ago

male

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Q: How early can you determine the sex of your baby?
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How many months do you have to be to determine the sex of the baby?

the sex of the baby is determined at six months


How long after a woman is pregnant can she find out what gender baby she is having?

A woman can have an ultrasound to determine the baby's sex as early as 15 weeks. However, an ultrasound is not 100% accurate - the only way to be 100% accurate is to have an amniocentesis, which is a risky procedure that a doctor won't perform just to determine the baby's sex.


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The sex of a child is determined by the father because the genes that determine sex come from the male sperm.


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