Before modern technology could tell expectant parents the sex of their child, how did you tell whether you were carrying a boy or a girl? And even more.
There are some early prediction methods that may be more or less precise in predicting the gender of your baby. You may find out if your baby is male or female during an ultrasound done between the 18th and 22nd weeks of pregnancy. You can discuss with your doctor whether this.
The baby's genes determine sex. All eggs contain an X chromosome, while sperm can have an X or a Y chromosome. If the egg is fertilized by a sperm cell.