MRI for infants is not harmful to the brain. MRI is a physical exam like ultrasound and does not harm the child in any way. Unlike chest X-ray and CT, which have radiation and can cause some damage to the child. Nowadays, the damage of chest X-ray is also very small, and CT is relatively larger, but we do any test according to the condition. Sometimes the tests are not done and the diagnosis is not clear and the treatment of the disease is affected. Therefore, it is important to listen to your doctor’s advice when deciding whether or not to do these tests, and try to choose tests that are not harmful or less harmful depending on your child’s condition. MRI exams take longer, usually more than 10 minutes, while CT only takes 1-2 minutes. For MRI, sedation is required for children under three years old.