Many women receive ultrasounds during their pregnancies.
During the scan, if the baby turns so that the examiner can see between the
legs, the sex can be determined. While ultrasounds are not 100% accurate, when
the male genitalia is obvious - there is little reason
to doubt its accuracy.
When the sex can not be
determined by ultrasound and there are medical reasons for determining the sex
of the unborn child, an amniocentesis can be performed. An amniocentesis
inserts a needle into the uterine cavity and removes approximately 20 cc of
amniotic fluid which surrounds the fetus. Exfoliated fetal cells are contained
within this fluid. These cells can be cultured and the chromosomes examined and
identified. Normal karotype for a female is 46,XX and normal karotype for a male
is 46, XY.
If the year of conception and the age of the mother are both even numbers or both odd numbers, it will be a girl. If
the year of conception and the age of the mother are one even and one odd
number, it will be a boy.
If the mother picks up the key by its head, it will be a
girl. If the mother picks up the key by its stem, it will be a boy.
If the mother shows you her palms, it will be a girl. If
the mother shows you the back of her hands, it will be a boy.