Between our middle ear and our throat there is a passage called the eustachian tube. The eustachian tubes keep pressure from building up by letting air move in and out of the middle ear. When we are young, (especially happens in the toddler years when children are younger than 3 years old), the eustachian tubes were very small and less able to keep germs out.
The Eustachian tubes get longer and usually work better in older children. If the child has allergies or catch a cold, the eustachian tubes can get blocked up and let germs get in the middle ear. Then the number of germs can grow inside the middle ear and cause an ear infection.
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