Most pregnancies last 40 weeks. A baby born before the 37th week is known as a premature or pre-term baby. Medical advances have meant that more than 9 out of 10 premature babies survive, and most go on to develop normally.
Premature babies, especially those born very early, often have complicated medical problems. Typically, complications of prematurity vary. But the earlier your baby is born, the higher the risk of complications.
Depending on how early a baby is born, he or she may be: