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A preterm infant was born at 25 weeks, weighing 650 g. After an initial period of ventilation, they have been successfully weaned to continuous positive airways pressure and then high-flow oxygen therapy. Growth has been suboptimal and has dropped from the 9th centile to the 0.4th. During the ward round, the consultant opts to continue high-flow oxygen at 3L rather than weaning to low-flow oxygen, despite reassuring blood gases, in order to maximise growth. The resident doctors on the ward round ask for the rationale for this.