A 28-week gestation male infant born to a 32-year-old primigravida mother is delivered via emergency caesarean section for placental abruption. The infant weighs 1200 g. At 2 hours of life, the baby develops grunting, nasal flaring, and intercostal retractions. Chest X-ray shows a diffuse ground-glass appearance with air bronchograms. Blood gas analysis reveals pH 7.28, PaCO₂ 52 mmHg, PaO₂ 58 mmHg on 60% FiO₂. The infant was not given antenatal corticosteroids. What is the most appropriate immediate management?

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