Three-month-old babies love to stick out their tongues may be physiological reasons, such as saliva secretion, but also pathological reasons, such as oral ulcers and other causes. 1. physiological reasons: three months baby oral cavity capacity is relatively small, saliva secretion is more vigorous, the baby may stick out his tongue to spit saliva, this situation is normal. 2. Pathological reasons: if the baby suffers from mouth ulcers, there may be pain symptoms, will also stimulate saliva secretion, the baby will feel uncomfortable, the baby may be through the tongue to relieve the pain symptoms. Three-month-old babies love to stick out their tongues may also have other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor’s treatment.