Is a round belly definitely a sign of having a girl?

A round belly cannot accurately indicate whether the baby is a boy or a girl. The shape of a pregnant woman's belly is related to factors such as hormone levels, pelvic structure, and individual body type, none of which are associated with the baby's gender. Therefore, the shape of the belly should not be used to determine fetal sex. To accurately determine the baby's gender, medical examinations such as ultrasound scans or chromosomal analysis in maternal blood should be performed.