Is it normal for a 3-month-old baby to play with saliva bubbles?

It is usually normal for a 3-month-old baby to play with saliva bubbles. This behavior could be due to teething, but it might also be caused by pneumonia.

A 3-month-old baby exploring their body may naturally start playing with drool and blowing bubbles. If the baby feeds well, is in good spirits, and gains weight normally, parents need not worry excessively. Playing with saliva bubbles can occur when the baby is teething, as emerging teeth stimulate the salivary glands to produce excess saliva. During teething, babies may exhibit symptoms such as blowing bubbles, chewing on fingers, sucking on pacifiers, or biting objects frequently. However, if drooling and bubble-blowing are caused by pneumonia, this is abnormal. In such cases, the baby may produce bubbly secretions as a way of expelling phlegm, often because their cough reflex is weak and they cannot clear mucus effectively. Additional symptoms such as fever, cyanosis (bluish skin), and difficulty breathing may also appear, requiring prompt medical treatment.

In addition, bacterial or viral infections causing upper respiratory tract infections may also lead to excessive drooling and bubble-playing, as the baby may have difficulty swallowing saliva promptly.