Reassurance and breathing techniques to resolve stridor:
Jaw thrust while breathing
Pursed lip breathing through straw or endotracheal tube
Inhale through nose for 3 seconds and exhale through pursed lips for 3 seconds
"Pant like a dog" - rhythmic breathing with mouth open and tongue protruding forward
3 sniffs - take 2 quick then 1 slow inhalational sniffs through the nose, exhale slowly through mouth
Mild sedatives (eg benzodiazepines) may be effective in cases refractory to breathing techniques
Jaw thrust while breathing
Pursed lip breathing through straw or endotracheal tube
Inhale through nose for 3 seconds and exhale through pursed lips for 3 seconds
"Pant like a dog" - rhythmic breathing with mouth open and tongue protruding forward
3 sniffs - take 2 quick then 1 slow inhalational sniffs through the nose, exhale slowly through mouth
Paradoxical vocal fold motion
Larynx fracture
Stridor 
Tracheobronchial tear/injury
Stridor
Thyroid gland injury/trauma
Bulging fontanelle
Tracheal injury