Possible reasons for babies spitting up milk coming out of their noses It is normal for babies to spit up milk, but when spitting up milk comes out of their noses, it may cause concern for parents. This phenomenon is more common in newborns or young children. The following are several reasons that may cause babies to spit milk out of their nose: 1. Esophageal reflux The esophagus in the baby\’s stomach is not fully developed like that of adults, so when it is overly full, food can easily return to the entrance of the esophagus. In some serious cases,