Ψ One-month-old infants have a very keen sense of hearing and can discriminate small sound variations, such as the difference between bah & pah. By 6 months, infants can make all the sounds necessary to learn language.
Ψ Otitis media is primarily caused by a malfunctioning eustachian tube. The eustachian tube connects the middle ear to the back of the internal nose structures. The eustachian tube equalizes air pressure between the middle ear and the environment. If the tubes are blocked (occurs in an infection) these protective functions cannot occur and bacteria are swept up through the eustachian tube as a result of the pressure difference.