A 2-month-old baby suddenly starts crying and being fussy, requiring a search for the cause, such as fever or oral ulcers. Additionally, teething babies may experience slight discomfort, possibly with low-grade fever, poor mood, and loss of appetite, but they usually do not cry frequently. It is recommended to observe for any abnormalities in the baby’s mouth, such as vomiting or diarrhea. If you are concerned about the baby teething, you can try giving them some solid foods like teething rings or apple slices to help alleviate the discomfort. At the same time, ensure the baby’s diet is balanced and do not worry too much about their food preferences as they will gradually adapt to different types of food.