Newborns breathe much better through their noses than through their mouths. They have small nasal passages so any little bit of congestion can make their breathing sound very noisy; they may even sound like a washing machine when breathing. The only way for your baby to clear his nose is by sneezing, which explains why newborns sneeze a lot. Typically, the congestion bothers the parents more than the baby. If he is happy and feeding and sleeping well there is no reason to intervene. In fact, trying to suction his nose will only annoy him and suctioning too much can actually lead to increased congestion by irritating the nasal passages. 

If your baby is bothered by the congestion you can use some nasal saline drops and suction to help make him more comfortable. Keeping a cold mist humidifier running will also help. Call your doctor: if your infant is less than two-months-old and has a temperature 38 degrees C or above, is feeding poorly, is irritable, is having persistently rapid breathing, has a change of color to the lips to pale or blue, or if you have any other concerns