usually recovers by the age of two to three years. Your son's drooling and the laryngomalacia and it's surgical treatment
may be related if he also has any of the following:
1. Persistent Stridor. Maybe a recent upper respiratory infection?
2. Mouth Breathing
3. Damage to the larynx, pharynx, upper esophagus or lower cranial nerves.
4. In-coordination during swallowing.
5. Acid reflux
6. Reaction to any swallowed substance.
I hope that it is only normal drooling associated with teething.