What is the reason for a four-month-old baby constantly drooling?

Patient's question:

Symptom Description: The child started sucking their thumb at 3 months old and then began drooling.
History of Treatment and Effect: It's not about lacking anything. Currently, it's inconvenient to check in the hometown, and I will do so once I return.
Help Needed: What could be the reason for this, and how can it be prevented?

Doctor's answer:

Hello! Your situation is considered that infants and young children have small and shallow mouths, and their swallowing reflex function is not yet well developed. They cannot use the swallowing action to regulate saliva. When there is too much saliva in the mouth, it naturally flows out.
There are also many infants and young children who like to put their fingers, rubber teats, etc., in their mouths to suck, which can stimulate the mouth and increase saliva, causing drooling. Sometimes, there may be many small bubbles, but this is not a problem and will improve over time.
Based on your description, it seems that your child is currently in the teething stage, and drooling is normal—no need to worry. Please pay attention to follow-up observation. If you notice any abnormalities, take your child to the hospital for treatment in a timely manner.
Best wishes!

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