When an infant spits up milk into the ear, it usually does not cause serious effects if it is treated in a timely manner. However, untimely or untreated treatment may lead to otitis media. When a baby spits up milk into the ear, you can immediately let the baby side to the ear into which the milk flows, to prevent the milk flow into the depth of the ear, and then can use a clean swab to clean up. In the process of cleaning, the action should be gentle, so as not to damage the mucous membrane of the ear canal. At the same time, the swab should not go too deep into the ear to avoid damage to the eardrum. If you fail to clean up in time, with the prolongation of time, ear canal cerumen can be formed, which can easily cause bacterial infection, leading to otitis media, tinnitus, ear blockage, ear stuffiness and other symptoms, and in severe cases, can cause serious impact on hearing. Therefore, infants should be held upright and patted on the back after feeding to avoid spitting up. If spitting up occurs, parents should pay enough attention to clean it up in time to avoid serious consequences.