There are functional and anatomical closure of the foramen ovale. The foramen ovale usually closes functionally after birth and anatomical closure takes 5-7 months. The fetus is in the mother’s womb and there are peculiarities in blood circulation, with blood flowing from the right atrium through the foramen ovale into the left atrium. After the fetus is born, the pulmonary circulation is established and the pressure in the left atrium rises, pressing the oval foramen valve over the interatrial septum to cover the oval foramen and complete functional closure. Anatomic closure is the adhesion of the foramen ovale valve to the edge of the left atrium, creating a permanent closure. Clinically, the time span of the foramen ovale closure is large. generally, after 3 months of life, most of the infant’s foramen ovale is in functional closure. after 7 months, if the child’s foramen ovale is not completely closed, it should be rechecked again at 9 or 12 months. if the foramen ovale is closed on recheck, there is no need to recheck; if it is not closed, it needs to be rechecked once every 6 months, and there is a possibility of natural closure. if it is still not closed after 3 years of age, it can be diagnosed as congenital foramen ovale The foramen ovale is not closed. Mild patent foramen ovale does not have a significant impact on the hemodynamics of the heart and may not be treated. If the atrial septal defect is too large, greater than 8-10 mm, with a large fractional flow, early surgical repair is recommended.