The dry and cold climate in winter makes babies’ skin resistance weak, so they are especially prone to rotten corners of the mouth. The baby’s mouth corner problems, not only affect the beauty, but also affect the baby to eat and talk, more difficult to heal. The baby’s rotten corners, in addition to attention to daily care, but also need to master some medication rules. “The typical symptom of keratitis is that the corners of the mouth will be ulcerated, but also crusty, blistered, cracked and flaky. The first one is malnutrition keratitis, winter susceptible to this disease, because the winter climate is relatively dry, vegetables, fruits eat relatively less, often have a lack of vitamin C and B2, causing the corners of the mouth dry and cracked. The second type is coccidiostomatitis, which is caused by streptococcal and staphylococcal infections. The third type is fungal keratitis, which is caused by fungal infections. It is characterized by bilateral wet white corners of the mouth with erosions or ulcers, often accompanied by labyrinthitis and lip erosions. For babies with corns, we recommend that mothers treat them according to the different causes. For corns caused by vitamin B deficiency, parents can choose more vitamin B rich foods in the child’s diet, such as spinach, soy products, eggs, millet, milk, carrots, animal liver, etc. If the mother does not see results with dietary supplements, she can consider a multivitamin. If the baby is not suffering from vitamin deficiency, then a big reason is that the baby is suffering from fungal stomatitis. The general cold and dry climate will make the baby’s lips and skin around the corners of the mouth dry and cracked, and germs take advantage of the situation to cause infection. The performance of the bilateral corners of the mouth wet white and white more obvious, with erosion or ulcers, treatment should be localized with mycophenolate liquid cleaning, wipe dry, and then local rubbing antifungal drugs, etc., should not use broad-spectrum antibiotics. In addition to the medication to be careful, in the daily care of mothers and fathers should also pay attention to the symptoms of dry and cracked corners of the baby’s mouth, most will involuntarily lick with their tongues, mothers will also use lip balm to frequently smear the baby’s small lips, which not only does not get the effect of moisturizing, saliva quickly evaporated, the microorganisms in the saliva brought to the fissure, causing bacterial infection, but will aggravate the symptoms. It is okay for the mother to apply lip balm for her baby, but remember to apply it frequently dozens of times a day. Such excessive use of lip balm will make the lips’ own barrier ability decrease and sebaceous secretion decrease. At this time, once you leave the lip balm, your lips will naturally be very dry. Applying 3-5 times a day is more appropriate. Daily careful care plus symptomatic treatment can make your baby say goodbye to rotten corners of the mouth and spend the winter safely.