Is It Normal for a Baby to Start Drooling from Four Months Old?

A baby starting to drool from four months old may be a normal physiological phenomenon, as the oral structure and swallowing function of infants are not yet fully mature with growth and development. However, pathological drooling may indicate certain diseases, such as angular cheilitis, stomatitis, indigestion, or developmental abnormalities in the central nervous system.
One minute to read