Drooling and spitting bubbles in a three-month-old baby may be a normal condition. For example, teething, but also may be an abnormal situation, mostly seen in pneumonia. It is necessary to alert parents and pay attention to identify which situation the baby is in.1. Normal situation: three months old baby with drooling and spitting bubbles may be caused by teething. The baby’s teething will stimulate the salivary glands to secrete excessive saliva, while the baby’s poor swallowing ability, the bottom of the mouth is shallow and not easy to accumulate saliva, there will be drooling performance. The baby may feel uncomfortable when teething, which can lead to spitting bubbles, chewing fingers, sucking pacifier, love to bite things; 2, abnormal situation: but if pneumonia causes baby drooling and spitting bubbles, it is an abnormal situation and needs to be treated in a timely manner. When the baby has pneumonia, the phenomenon of spitting bubbles used to discharge phlegm will occur because the cough reflex of the three-month-old baby is poor and the phlegm cannot be discharged smoothly. In addition, the baby is often accompanied by fever, cyanosis and breathing difficulties. Parents should pay attention to this and take the baby to the hospital for treatment in time to avoid further progress of the baby’s condition.