Swollen and painful gums of 5-year-old baby may be caused by gingivitis, gingival fibromatosis, nutritional diseases such as vitamin C deficiency, etc. According to different causes, we can choose general treatment, surgical treatment and supplemental nutrients and other methods. 1. Gingivitis: Long-term food congestion, tartar and other local factors in the oral cavity may plaque aggregation, induced or aggravated by local inflammation of the gums, the symptoms of swelling and pain in the gums. You can use scaling to remove plaque and tartar, and then use hydrogen peroxide to rinse the gingival sulcus, if necessary, you can choose chlorhexidine gargle rinse. 2. Gingival fibromatosis: often in young children, with familial or hereditary, to the fibrous connective tissue hyperplasia of the gingival tissue as the main pathological manifestations, there may be swollen and painful gingival manifestations. Treatment is usually based on surgical treatment to remove the hyperplastic gums, such as gingivoplasty. 3. Nutritional diseases: If you have a vitamin A or B deficiency or folic acid deficiency, your gums may become thickened, and bleed when touched. Usually you can eat foods rich in these, such as liver, carrots, spinach, etc. If necessary, you can follow the doctor’s advice with vitamin A or vitamin C preparations. In addition to the above causes of swollen and painful gums, may also be related to leukemia, diabetes, pregnancy and other reasons, if the symptoms continue to be unrelieved, you should consult a doctor in a timely manner to determine the cause of the disease, so as not to delay the condition.