No, the fetal heart rate cannot accurately determine the gender of a baby. The belief that a higher or lower heart rate can indicate whether it's a boy or girl is just a myth. Gender determination is typically done through ultrasound or genetic testing. The fetal heart rate can vary throughout pregnancy and is influenced by various factors such as maternal activity, gestational age, and individual differences. It's always best to consult with your healthcare provider for accurate information about your baby's gender.