Pulmonary haemorrhage in children is rare. Respiratory infections, foreign body aspiration, cystic fibrosis and congenital heart diseases remain the leading causes. We present a 7- week-old male infant, previously fit and well who developed pulmonary haemorrhage while breastfeeding in a sling strapped to mother. We hypothesise that accidental asphyxiation during breast feeding, generated forced inspiratory effort against an obstructed upper airway and led to negative pressure pulmonary oedema (NPPE) and pulmonary haemorrhage. Accidental asphyxiation should be considered in the differential diagnosis of children presenting with pulmonary haemorrhage.