If you have a mouth ulcer during breastfeeding, you can spray watermelon cream spray, this drug contains borax, with heat, detoxification, the role of fire, but also to promote the rapid healing of mouth ulcers. During this period, you should pay attention to observation, if there is pain or fever during the ulcer, which indicates the performance of inflammatory infection, you can also cooperate with some anti-inflammatory drugs, you can take cephalosporin or amoxicillin, this drug will not affect breastfeeding, but also have anti-inflammatory, promote the healing of ulcers. If the ulcer is serious, you should also try to pay attention to a light diet, do not eat too greasy food and spicy, irritating food, to avoid aggravating the symptoms of mouth ulcers. Usually you can eat some fresh fruits and vegetables in moderation because they contain a lot of vitamins that can reduce the chances of recurrence of mouth ulcers.