A premature baby is a baby that is delivered before 37 weeks. Every year an estimated 15 million babies in the world are born preterm. This number is on the rise. The reasons why babies are born early are unknown. But they think you have an increased risk of premature labour if you have a multiple pregnancy and previous premature birth. Doctors also think if you eat unhealthy, smoke or are overweight it could be a contributing factor to this. The survival rate of premature babies is increasing because there is increased and better medical care also better technology.