|Earaches caused by ear infections will occur in three out of four children by the age of three. These infections occur when mucus blocks the passages in the ears called eustachian tubes. This happens frequently in children because their eustachian tubes are shorter, so they become more easily blocked. Signs your child may have an ear infection include: fever, tugging at the ear, increased irritability, crying and difficulty hearing. Many ear infections clear up within two or three days. You should talk to your pediatrician if the condition persists longer.