P07: Disorders related to short gestation and low birth weight, not elsewhere classified

P07.2: Extreme immaturity

A child is usually born from the 38th to the completed 42nd week of pregnancy and is then fully developed. The weeks of pregnancy are most commonly counted from the day of the last period. A birth is premature if the child is born before the end of the 37th week of pregnancy. When a child is born too early, it may weigh too little when it is born.

With a premature birth, some organs may not yet be properly developed. For example, if the lungs are not yet properly developed, breathing difficulties may occur. The blood vessels in the brain are still very delicate and can thus easily tear. If there is a bleed into the brain, there can be health problems.