AKT · Child health/Neonatal & surgical

Transient tachypnoea of the newborn (TTN)

Delayed clearance of fetal lung fluid (term/late-preterm; C-section)

Overview

The commonest cause of respiratory distress in TERM/late-preterm newborns — delayed clearance of fetal lung fluid, especially after CAESAREAN section (no labour to squeeze the lungs). Tachypnoea develops soon after birth and RESOLVES within 1-2 days. CXR shows fluid in the horizontal fissure and prominent perihilar markings. Supportive (oxygen); a diagnosis of exclusion (cover for sepsis until clear).

Recognise

TERM/late-preterm baby, often after elective C-SECTION, with tachypnoea, mild recession/grunting from soon after birth
Self-limiting — RESOLVES within 1-2 days
CXR: fluid in the horizontal fissure, prominent perihilar streaking, hyperinflation

Red flags

Worsening/persistent distress → reconsider sepsis, RDS, pneumonia, congenital heart disease
Significant oxygen requirement

Differentials & how to tell them apart

Respiratory distress syndromePRETERM, ground-glass CXR, surfactant deficiency — TTN is term/C-section and resolves quickly

Congenital pneumonia/sepsis (GBS)can mimic — cover with antibiotics until excluded

Meconium aspirationmeconium-stained liquor, post-term, patchy CXR

Investigations

Clinical + CXR (fluid in the fissure); blood gas; treat as/exclude sepsis until clear.

Management

Supportive oxygen + observation (cover for sepsis until excluded)

1Supportive care (oxygen as required), observe — TTN resolves within 1-2 days. Treat as/exclude sepsis until clear.Gate: It is a diagnosis of exclusion — cover for congenital pneumonia/GBS sepsis with antibiotics if there is any doubt, and reconsider RDS/CHD if distress persists beyond a couple of days
2Wean oxygen as it resolves; reassess if not settling.

Supportive (oxygen as needed) — observation; usually self-limiting

Cover for sepsis until excluded — antibiotics if any doubt

Key points

Term baby (often C-section) + tachypnoea soon after birth + fluid in the fissure + resolves in 1-2 days = TTN. RDS is the preterm/ground-glass mimic; always cover for sepsis until clear.

Monitor & prognosis

Respiratory status; resolution.

Excellent — self-limiting.

Source: RCPCH; BAPM