The earliest an ultrasound can possibly determine the gender of a fetus is 12 weeks. Most doctors won't attempt to determine the gender until 16-20 weeks. Unlike amniocentesis, ultrasound genderizing isn't an exact science. Depending on the way the baby lays, it can be difficult to see the genitals. Some radiologists will influence the baby to move into a different position to catch a glimpse, or you could consume something containing sugar to make the fetus more active. Amniocentesis, if you have to have one done, determines the gender through chromosomal analysis and this is fool-proof.
Other answers from contributors:
Gender is determined the moment of conception, the male also determines the sex of the baby
At conception. If a Y-containing sperm fertilizes the egg, it will be a male. If an X-containing sperm fertilizes the egg, it will be a female.
16 wks
Sex does not feed a baby. Sex makes a baby.
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a diet can not effect the baby sex. once your pregnant the baby sex is already there
Sex positions have got nothing to do with the sex of the baby.
the sex of the baby is determined at six months
Have sex.
A baby ....
The sex of the baby can be determined at the time of purchase if a random birth package is being used, the sex of the baby will only be known at birth.
penis+vagina= baby/ sex
No the pregnancy test lone will not tell you the sex of the baby.
The sex of the baby isn't known, Mariah chose to just wait till the baby is born to see
Sex, Sex, Sex and more Sex.