my baby excess drooling from 2 months back....my baby boy is 3months old , can u tell what is the reason

A. This becomes especially apparent at 3 to 6 months of age. The increased flow of saliva that often signals the appearance of a new tooth seems to soothe tender gums; however, if your baby appears to be drooling excessively and looks ill, she may be having trouble swallowing, which requires medical attention.