When is the gender of a fetus determined?

Answer 1

about 20 weeks.. if the BABY cooperates.

Answer 2

The gender is determined by the sperm at the time of conception but YOU can find out what the gender is by:

Chorionic Villus Sampling (CVS)
This diagnostic test is usually performed between 8 and 11 weeks gestation, sometimes as late as 13 weeks. This is generally a test for people who have a high risk of genetic abnormalities. Test results are available within 7 to 14 days. Miscarriage rate from CVS is about 4%, recent studies indicate that if the CVS is done before 10 weeks gestation there is an added risk (.5% to 1.7%) of limb deformity, and about 3% CVS is associated with serious decline in amniotic fluid protection. There is a greater incidence of false positives because of the differences between the cellular genetic material of the choirionic villi and the fetus. There is a small chance that the sex they determine is wrong as well.

Amniocentisis
This diagnostic test is performed as early as 9 weeks and for diagnostic purposes, 18 weeks gestation. There is a risk of 1-1.5% miscarriage and 1% chance of other pregnancy complications (infection, premature labor, injury to the fetus, cord, or placenta, rupture of membranes, etc.). The tests take about 2-4 weeks to run. There is a small chance that the sex they tell you is incorrect.

Ultrasound
While ultrasound can be performed at any stage of pregnancy for the purpose of finding out the sex it is best done between 18 and 26 weeks. Most care providers will not give an ultrasound for the specific purpose of finding out the sex, and the American College of OB/GYNs has issued a statement against routine ultrasound exposure during pregnancy. However, most physicians do not heed this warning. Adequate studies on ultrasound safety have not been done, but we do know that ultrasound exposure can change the way the cell reproduces and moves. There have also been studies indicating that ultrasound heats up the cells. This method is the most frequent for finding out the sex of a baby, however, it is the least accurate. Accuracy depends on several factors: baby's cooperation, gestational age, technician's ability, etc.

Answer 3

Chromosomally the gender is determined at conception based on whether the sperm that did the fertilizing carries an X chromosome (female baby) or a Y chromosome (male baby.) All developing fetuses follow a female template until about 6 weeks, when the Y chromosome directs the release of male hormones (this is why men have nipples... they develop before the Y chromosome causes masculinization.)

If you mean when CAN the gender of the unborn baby be determined, that's about 20 weeks when it's big enough for an ultrsound to see that sort of detail.

Answer 4

The gender is determined at the exact moment of fertilization. It depends on whether an X or a Y sperm reaches the egg first. X is girl, Y is boy.

But you probably meant when can you tell what gender the baby it, and that is around 20 weeks, when they schedule the (usually 2nd) ultrasound.

Answer 5

A Baby's sex is determined by the end of the first trimester, but sonograms being what they are, you won't be able to tell until the fifth month, when baby's a little bit bigger. But rest assured, all of his body parts are fully formed by the time he's ten weeks old in the womb and then all he has to do is grow.

Answer 6

For a human fetus (is that redundant?) at the moment of conception. However, my understanding is - and others please jump in here - that other animals, perhaps even other species, can have the gender changed after conception by environmental factors such as temperature.

Answer 7

The gender of a child is determined at the moment of conception. Along with hair color, eye color and all other genetics.

Answer 8

it is determined the second the sprem gets in the egg! The doctor can't tell until you are 15-20 weeks in your pregnancy

Answer 9

Usually around 26 wks

Answer 10

At conception, the sperm carries the chromosomes that determine the sex- so which ever gets there first.

Answer 11

Usually around the 5th or 6th month. Sometimes it may be as early as the 4th month.