What does it mean when a 7 month who sleeps 12 hours old snores through the night?

No sounds at night. Children should make no sounds when breathing at night. Please have your child checked out by your pediatrician or have them see a pediatric ent.
Often nothing. Often nothing; however, children generally snore much less often than adults. And anyone who snores can have a problem as a cause. Things such as large tonsils and adenoids (similar tissue to tonsils in the back of the throat) or anything that obstructs the airway can result in snoring. Bad allergies, or nasal congestion can as well as children tend to breath through their noses. Anything symptoms?