Methods claiming to predict the gender of a baby, often referred to as "boy or girl tests," such as urine tests, fetal heartbeat rate, or old wives' tales, are not scientifically proven or reliable means of determining the baby's gender. These methods are mostly based on myths, cultural beliefs, or coincidental observations. The only accurate and reliable methods for determining the baby's gender are medical techniques like ultrasound or genetic testing. An ultrasound performed around 18 to 22 weeks of pregnancy can provide a visual assessment of the baby's external genitalia, offering accurate gender determination. Additionally, genetic testing, such as non-invasive prenatal testing (NIPT) or invasive procedures like amniocentesis or chorionic villus sampling, can also provide highly accurate results for gender determination. It is advisable to consult with a healthcare professional for accurate and reliable information regarding the baby's gender.