Baby's oral ulcers generally are considered under the following circumstances:

The first type is caused by infections, such as viral infections, herpes, etc.; the second type might be due to a deficiency in vitamins or trace elements, such as when children are picky eaters, which can lead to poor nutrition and vitamin deficiencies. The third type is traumatic oral ulcers which might occur if the child does not often chew hard objects; these are the general scenarios.

We should always encourage children to eat fresh vegetables and fruits to prevent the occurrence of oral ulcers. Since vitamin deficiency is the most common cause of oral ulcers, it is important to consume fresh vegetables and fruits and avoid habits like children biting their fingers or eating random items, which might cause infection-induced ulcers. If the child uses medicine spray like "Kaikoujian", and it works well, that's adequate for home observation. If after using the medication and increasing the intake of vegetables and fruits, the results are not ideal, then it is necessary to visit the hospital promptly.

(The use of medications should be under the guidance of a physician.)