Babies actually drool at birth, but early on it tends to manifest itself as spilling milk. Babies actually drool at birth, but early on it tends to manifest itself as milk overflow. And at 3 months, babies will shed excess saliva as their salivary glands begin to develop vigorously and they are not yet able to swallow very well. And between 4 and 6 months the baby will appear teething phenomenon, teething may be discomfort in the mouth, the production of excess saliva will also make the baby appear drooling more. At the same time, some diseases such as mouth ulcers can also lead to babies drooling phenomenon, so if the baby drooling for a long time and did not improve, you need to go to the hospital in time for a detailed examination to find out the cause of the disease, and then actively under the guidance of the doctor for treatment.