# Paediatric Airway and Intubation > Paediatric airway and intubation for NEET-PG Paediatrics, covering anatomical differences from adults, Cole tube size formulas and rapid sequence induction. - Canonical URL: https://prepelephant.com/topics/neet-pg/paediatrics/paediatric-airway-and-intubation - Exam / course: NEET-PG · Subject: Paediatrics - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-14 - Last updated: 2026-10-14 - Reference basis: Nelson Textbook of Pediatrics; Morgan and Mikhail's Clinical Anesthesiology - How to cite: "Paediatric Airway and Intubation", PrepElephant, https://prepelephant.com/topics/neet-pg/paediatrics/paediatric-airway-and-intubation ## Direct answer Paediatric airway management differs from adults because the child's head and tongue are proportionally large and the larynx sits higher. In young children the narrowest point of the airway is the cricoid ring rather than the glottis, so mild oedema can obstruct it. Uncuffed tube size is estimated as age in years divided by four plus four millimetres, and rapid sequence induction is used when aspiration is a concern. ## What you must remember - **Anatomy:** a large occiput and tongue relative to the oral cavity, with the larynx higher, at about C3 to C4 in infants. - **Narrowest point:** the cricoid ring in young children, compared with the glottis in adults. - **Epiglottis:** long, floppy and omega-shaped in infants, often obscuring the view at laryngoscopy. - **Uncuffed tube:** internal diameter in millimetres equals age in years divided by four, plus four. - **Cuffed tube:** internal diameter equals age in years divided by four, plus 3.5. - **Tube depth:** about three times the internal diameter in centimetres, measured at the lips for oral intubation. - **Blade choice:** a straight blade is often used in infants and a curved blade in older children, with practice varying between centres. ## A stepwise rapid sequence induction Rapid sequence induction is a planned sequence that minimises the time the airway is unprotected. Each step is set up in advance, so the team can move quickly from induction to intubation. A plan for a failed intubation, including a rescue device and a surgical backup, is agreed before induction begins. 1. **Prepare the equipment:** check suction, a bag-mask, tubes of several sizes with a stylet, and the plan for a failed intubation. 2. **Pre-oxygenate:** give high-concentration oxygen by face mask until the end-tidal oxygen rises, which extends the safe apnoea time. 3. **Induce anaesthesia:** give an induction agent, and wait until the child is adequately deep before paralysis. 4. **Paralyse:** give a rapid-acting neuromuscular blocker to facilitate laryngoscopy without bag-mask ventilation in between. 5. **Intubate:** insert the tube sized by formula, then confirm placement with auscultation and end-tidal carbon dioxide. 6. **Secure and confirm:** fix the tube at about three times its internal diameter in centimetres, and confirm the position clinically and by capnography. ## Where the exam tries to catch you Questions on this topic usually test the tube formulas, the narrowest point and the order of RSI. - **Trap:** using the uncuffed formula for a cuffed tube — **Correct:** the cuffed formula is age divided by four, plus 3.5, which gives a slightly smaller tube. - **Trap:** assuming the glottis is the narrowest point in a toddler — **Correct:** the cricoid ring is narrowest in young children, so oedema or a tight tube causes obstruction there. - **Trap:** using bag-mask ventilation between induction and laryngoscopy in RSI — **Correct:** mask ventilation inflates the stomach and raises aspiration risk, so the sequence moves straight to intubation. - **Trap:** fixing the tube by age alone without measuring — **Correct:** the formula gives the estimate, and placement is confirmed by the clinical check and capnography. ## Frequently asked questions ### How is the uncuffed endotracheal tube size estimated in children? The uncuffed endotracheal tube size in children is estimated as age in years divided by four, plus four, giving the internal diameter in millimetres. A cuffed tube uses age divided by four, plus 3.5, so the formula chosen depends on whether the tube has a cuff. ### Why is the cricoid ring the narrowest part of a child's airway? The cricoid ring is the narrowest part of a child's airway because it is the smallest ring below the vocal cords in young children. Mild oedema at this level can cause significant obstruction, which is why tube size and fit matter so much in paediatric anaesthesia. ### Why is bag-mask ventilation avoided between induction and intubation in rapid sequence induction? Bag-mask ventilation is avoided between induction and intubation in rapid sequence induction because it inflates the stomach and increases the risk of regurgitation and aspiration. The aim is to move straight from paralysis to laryngoscopy and intubation. ### How is the depth of a tracheal tube set in a child? The depth of a tracheal tube in a child is commonly estimated as three times the internal diameter in centimetres, measured at the lips for oral intubation. The position is then confirmed by chest auscultation and by capnography.