Although we like to think that only grown men snore, babies can produce the sound effect too. Snoring is usually the result of air passing through your little one's narrow nasal cavity or the back of the throat. The noise may happen because a baby has a cold or because his nasal passage is clogged with milk or baby food -- which can get pushed upward when he spits up. Use a suction bulb or saline drops to clear the nose.
Because sleep disorders like sleep apnea (a condition that causes momentary stops in breathing) can also trigger snoring, you should tell your pediatrician what's going on. Very loud snoring or snorting, gasping for breath, choking, and very restless sleep are signs of apnea and need immediate attention.