<prompt> Bag and mask ventilation in newborn resuscitation is contraindicated in:Diaphragmatic herniaPulmonary hypoplasiaTracheo-oesophageal fistulaLaryngomalacia  <response>: Bag and mask ventilation is contraindicated in suspected or confirmed diaphragmatic hernia. It is done in: If the infant is apnoeicgasping Respiration is spontaneous but hea rate is below 100min. The capacity of the bag is 240 to 750 ml. It should be attached to O2 source 5 to 6 litresmin so as to deliver 90- 100 oxygen. 