Step 1: Start from the clinical meaning:
Doctors worry about small children with croup, epiglottitis or a foreign body because their airway is tiny and fixed. The anatomy explains why.
We can test each statement against what we know about airway obstruction in children.
Step 2: Work out the narrowest site:
In a child, the cricoid cartilage is a complete ring and lies below the vocal cords. The lining under the cords is loose and swells easily.
A ring of cartilage cannot widen, so any swelling pushes inwards and shrinks the lumen. This makes the subglottis the narrowest part of the child's airway.
Around puberty the glottis becomes the narrowest part, as in the adult.
The supraglottis is not the narrowest part at any age. So the statement in option (2) cannot be right.
Step 3: Test the remaining statements against the same logic:
Option (1): A funnel that narrows downwards towards the cricoid fits the idea of a narrow subglottis. The adult tube is cylindrical. This is true.
Option (3): A high larynx lets the epiglottis meet the soft palate. This forms a continuous channel from the nose to the larynx, so an infant can suckle and breathe together. This is true.
Option (4): A low anterior commissure with a higher posterior end gives slanting cords. This is the known infant pattern. This is true.
Step 4: Why this matters in practice:
Because the subglottis is the tight spot, a tube that passes easily through the cords can still jam below them. Doctors choose a smaller endotracheal tube for a child and often use an uncuffed or carefully sized one.
A short, floppy epiglottis and a large tongue also make the view of the larynx harder in an infant. A high larynx is the reason we use a straight laryngoscope blade in neonates.
A tracheostomy or cricothyroid puncture in a small child is also harder, since the landmarks are small and soft.
Step 5: Eliminate and decide:
Options (1), (3) and (4) describe real differences between infants and adults. Option (2) is the only one that names the wrong site.
The question asks for the FALSE statement, so we pick option (2).
Final Answer:
The narrowest part of the paediatric airway is the subglottis (cricoid level), so the supraglottis statement is false.
\[ \boxed{\text{Option (2)}} \]