The gender of a baby can be found out using various methods at different times during pregnancy:

• At-home early gender DNA blood tests can determine the baby's sex with over 99% accuracy as early as 6 weeks into pregnancy.
• Chorionic villus sampling (CVS) and non-invasive prenatal tests (NIPT) can reveal gender starting around 10 weeks.
• Amniocentesis can determine gender from 15 to 20 weeks.
• Ultrasound is typically used between 18 to 20 weeks for a highly accurate gender prediction (up to 99%), though it can sometimes be done as early as 11 weeks using the "nub theory" but with less accuracy (around 70%) at that early stage.

Most parents commonly find out the baby's gender during the anatomy ultrasound scan at about 18 to 20 weeks, but earlier blood tests provide earlier options with high accuracy. In summary, the earliest accurate option is an at-home blood DNA test around 6 weeks; ultrasounds are most accurate between 18-20 weeks but can provide earlier estimates with less certainty; genetic testing methods provide alternatives around 10 weeks.