Currently, my baby is 3 months old. When I was pregnant, my baby's heart had echoes in the left ventricle. At birth, the baby's heart had an oval hole d = 4.6 mm left-right shunt, the doctor asked me, is it dangerous for a 3-month-old baby to have left ventricular echo and foramen ovale?

Patent foramen ovale is a common congenital heart defect. It usually results from a hole in the heart that doesn't close properly after birth and has no obvious signs or symptoms.