Narrowest part in infant's respiratory tract is:
Subglottis
Glottis
Carina
None of these
(a) Subglottis(Ref. Scott Brown, 8th ed., Voll; 326)In infant's larynx the diameter of cricoid cartilage is smaller than the glottis, making subglottis the narrowest part, whereas in adults the narrowest part is the glottis.
Anatomy of Larynx