The condition PPHN which means Persistent Pulmonary Hypertension of Newborn may have some underlying reasons like asphyxia, infection or meconium passage in the uterus, but sometimes it may be due to an unidentifiable reason. Smoking and alcohol consumption during pregnancy may also precipitate this. It is not a must that it would repeat during next pregnancy, any way it is a good idea to have a gap of atleast 1 1/2 to 2 years in between pregnancies.