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

Patient's question:

No

Doctor's answer:

Generally speaking, drooling in babies is a phase-related phenomenon with certain regularity. In the neonatal period, a baby's salivary glands are not yet fully developed. In the first week after birth, their daily saliva secretion is approximately 50-80ml, which is 1/20 to 1/25 of an adult's. The saliva secretion of an infant increases to about 200-240ml per day around 4 months of age, and it only significantly increases after 5 months.