Whether the mother's respiratory disease will be improved by delivery and the risk of postnatal transmission in the delivery room when maternal symptoms are acute are both unclear. On the other hand, increased oxygen consumption and reduced functional residual capacity, which are normal in pregnancy, may facilitate maternal deterioration in patients with pneumonia.The rationale is that delivery is performed before the pulmonary situation worsens and ongoing maternal hypoxemia places the fetus at risk of compromise. Most authorities do not advocate delivery prior to 32 weeks, even though the maternal situation may worsen in the second week, given the known morbidity and mortality of very preterm infants.