Headphones will be placed on his ears and tones sent to each ear independently. If he responds its a positive. Also You can bounce a sound wave off his eardrum and judge by the strength and speed of its return , the health of the patients ear.
Yes earing test can be done. Nineteen month old means 1 1/2 and 1 month completed. After
completing 1 years only some childrens starts to speak, ear + other activities such as trying to
walk, sit etc. If such activities can b performed then whats the problem to test?