Level 1: Causes of snoring in babies It is very common for babies to snore while sleeping. This is because their breathing has not yet fully matured. During sleep, the soft tissues in the mouth and nose relax, causing air flow to be blocked, resulting in snoring. Level 2: How to tell if a baby’s snoring is normal. In most cases, there is no need to worry about baby snoring. But if your baby has any of the following symptoms while sleeping, you need to go to the hospital for examination in time