Keeping the foramen ovale open during pregnancy is necessary to maintain fetal circulation. After birth, the foramen ovale gradually closes as pulmonary vascular resistance decreases and right atrial pressure decreases. It is generally believed to close no later than 6 months after birth. However, because of the small diameter of the foramen ovale, usually only 1-3 mm, the blood flow between the left and right atria through this traffic for shunting is very small and does not cause heart enlargement or pulmonary hypertension, so there is no need to dispose of it and it does not affect the child’s vaccination. However, in very rare cases of stroke, headache or aura headache, especially in children and young adults without underlying cerebrovascular pathology, and in cases where clinical and brain CT or MRI examinations confirm an association with an unclosed foramen ovale, the foramen ovale can be blocked by interventional therapy. In infants and young children, sometimes it is not easy to clearly distinguish the unclosed foramen ovale from the small atrial septal defect near the fossa ovalis on echocardiography, so it is possible to review the cardiac ultrasound after 6 months-1 year to see.