The phrase "middle ear" refers to a small space located behind the eardrum. It is important for hearing because it contains tiny bones called ossicles that help amplify sound and transfer it to the inner ear. Full definition
It is the major cause of middle ear infections in children. (silvergen.com)
Signs of middle ear infection include odor, discharge, ear scratching, head shaking and head tilt. (lowchensaustralia.com)
On the flip side, babies who use a pacifier after age 6 months have an increase in middle ear infections, yeast infections (in the mouth), and intestinal infections. (babycenter.com)