Hi, The most likely cause of excess salivation or drooling in newborn can be due to a common condition known as Ankyloglossia or tongue-tie. In this condition a band of tissue present beneath the tongue in the floor of the mouth is thick and limits tongue movements. Although this condition is detected at routine check-up at birth, it is not uncommon to miss it initially particularly when mild. These infants presents with feeding difficulty like unable to suck the breast or difficulty in rooting. Kindly, visit doctor to get your child examined to rule out ankyloglossia or related pathology. In addition, avoid using formula food unless lactation is failed, as mothers milk is the best for babies well being. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Ayesha Shareef, General & Family Physician