However, there are no reports of MRI having significant adverse effects on people, so for adults and children, MRI is a better method of examination. Now with the improved machine, the image is clearer and the scan speed is better and faster than before. It is better for infants to sleep for MRI, as there is no way to image if the limbs move around. MRI for infants and even fetuses is a safe and reliable method as no harm has been reported.