He wasn't babbling much and his 
swallowing reflex wasn't good.
(15) The 
swallowing reflex method, which is independent of the patient's ability to cooperate, improved the rates of adequate NGT placement.
The therapy program consisted of thermal tactile stimulation to trigger 
swallowing reflex, laryngeal mobilization to support hyolaryngeal elevation, and neuromuscular electrical stimulation to activate the anterior neck muscles.
Eight of the 9 infants had loss of pharyngeal and laryngeal sensitivity leading to delays in initiation of the pharyngeal (or semiautomatic) swallowing phase and evidence that the 
swallowing reflex was triggered only when the bolus arrived on pyriform sinuses or the retrocricoid region, a delay that is associated with increased risk of aspiration before swallowing (Figure 2).
The presence of thickening on the posterior laryngeal wall, tremor in structures (base of tongue and vallecula), early escape (characterized by the presence of food in the hypopharynx or larynx before the 
swallowing reflex was triggered), vallecular stasis in glossoepiglottic folds and pyriform sinus (characterized by accumulation of food after the third swallowing on the mentioned structures), penetration (characterized by the presence of food in the laryngeal vestibule), tracheal aspiration (characterized by food intake in the region located below the vocal folds, in the subglottic region and in the trachea, at any time of swallowing), and cough reflex was observed.
This is called the 
swallowing reflex, in which the larynx rises to prevent material from entering the lungs and the palate rises to prevent material from entering the nose.
(2001) 20 concluded that the involvement of the CNS may contribute to the delay in the 
swallowing reflex shooting and abnormal EMG EES can identify dysphagia in this disease.
Precipitating factors for foreign body aspiration in the elderly possibly include a depressed mental status, intubation, or impairment in the 
swallowing reflex. Tachypnea, which can be associated with medical conditions common to this age group, has been shown to alter the coordination between deglutition and respiration.
* Neuromuscular dysphagia is either a 
swallowing reflex problem, a disorder of the pharyngeal and striated esophagus muscles, or an esophageal smooth muscle disorder.
Then several 
swallowing reflex motions occur, including a series of complex throat neuromuscular reactions, which push the bolus into the esophagus.