If a 4-month-old baby has eczema, it should be treated symptomatically and according to the disease, because the baby’s skin is relatively thin and tender, and also very sensitive, so it is necessary to be careful when choosing treatment options. If the eczema is in the acute stage, there is severe redness and swelling, the rash has obvious oozing, it is recommended that wet compress treatment, you can use furacilin solution, rehabilitation of new liquid, lactic acid isacridine solution, or 0.9% saline, 6-8 layers of sterile gauze wetted and then cold compresses in the trauma, each time for 5-10 minutes, 2 times a day is appropriate. When the color of the rash turns dull and the ooze dries up, the rash enters the subacute stage, and you can consider applying zinc oxide externally for astringent and antipruritic treatment. When the rash enters the chronic stage, that is, the color of the erythema turns darker and there is a thin layer of scales on the surface, you can consider applying topical dieldrin or mometasone furoate for anti-inflammatory treatment. After the topical application of medication, you can apply a skin lotion for babies, mainly to keep the skin moisturized.