Heart defect?

So my past few ultrasound my doctor has noticed something strange about my babies heart so he brought in a “specialist” and he said that the right ventricular track is dilated, so now my doctor is sending me to a pediatric cardiologist to get a more detailed ultrasound and he could tell me what it means and how it could affect my baby if it is anything to worry about.. does anybody know what it means my doctor didn’t tell me much..