Why do some children get recurring ear infections?

Predisposed. Regular otitis media is a sequential event. The fluid made by the middle ear walls is trapped in that space by impaired drainage thru the eustacian tube. Germs from the throat enter that space & cause infection. Smaller kids/kids with allergies or colds/kids with cleft palate etc are predisposed to recurrence because the drainage doesn't improve until the head grows big enough to improve the drain.