Baby drooling may be caused by oral thrush, glossitis, pharyngitis, or tonsillitis. Usually, once the disease is healed, the drooling will improve. Persistent drooling can be a symptom of central nervous system disorders, such as congenital brain maldevelopment, encephalitis, or post-infectious encephalopathy. This is due to brain abnormalities that impair the regulation of swallowing saliva. It is recommended to consult a pediatrician for a diagnosis and treatment.