2 or 3, or anotia. Anotia literally means "no ear" and is the most severe form of microtia. In Grade 1 microtia, the ear is smaller than normal, but has most of the features of a normal ear.

Children diagnosed with the most severe grade of microtia don’t have an outer ear at all. Photo courtesy 3DBio Therapeutics According to 3DBio, about 1,500 babies are born with microtia in the U ...