The birth and mortality numbers from the CBS include all livebirths, regardless of gestational duration, and all stillbirths from 24 weeks of gestation and onwards. In the Perinatal Registry, gestational duration of both liveborn and stillborn children is available. They register all liveborn and stillborn children from 22, 24 or 28 weeks of gestation and onwards (dependent on the report: fetal, neonatal or perinatal mortality). Therefore, data from these institutions on (still)births can not simply be compared one-on-one. United Kingdom
The registration of stillbirths has been required in England and Wales from 1927 and in Scotland from 1939 but is not required in Northern Ireland. Sometimes a pregnancy is terminated deliberately during a late phase, for example due to congenital anomaly. UK law requires these procedures to be registered as "stillbirths". England and Wales
For the purposes of the Births and Deaths Registration Act 1926 (as amended), section 12 contains the definition:"still-born" and "still-birth" shall apply to any child which has issued forth from its mother after the twenty fourth week of pregnancy and which did not at any time after being completely expelled from its mother, breathe or show any other signs of life.A similar definition is applied within the Births and Deaths Registration Act 1953 (as amended), contained in s.41. The above definitions apply within those Acts thus other legislation will not necessarily be in identical terms.
Hyperoxia occurs when cells, tissues and organs are exposed to an excess supply of oxygen (O2) or  higher than normal partial pressure of oxygen.In medicine, it refers to excess oxygen in the lungs or other body tissues, which can be caused by breathing air or oxygen at pressures greater than normal atmospheric pressure. This kind of hyperoxia can lead to oxygen toxicity, caused from the harmful effects of breathing molecular oxygen at elevated partial pressures. Hyperoxia is the opposite of hypoxia; hyperoxia refers to a state in which oxygen supply is excessive, and hypoxia refers to a state in which oxygen supply is insufficient. In the environment, it refers to excess oxygen in a body of water or other habitat. Signs and symptoms
Associated with hyperoxia is an increased level of reactive oxygen species (ROS), which are chemically reactive molecules containing oxygen. These oxygen containing molecules can damage lipids, proteins, and nucleic acids, and react with surrounding biological tissues. The human body has naturally occurring antioxidants to combat reactive molecules, but the protective antioxidant defenses can become depleted by abundant reactive oxygen species, resulting in oxidation of the tissues and organs.The symptoms produced from breathing high concentrations of oxygen for extended periods have been studied in a variety of animals, such as frogs, turtles, pigeons, mice, rats, guinea pigs, cats, dogs and monkeys. The majority of these studies reported the occurrence of irritation, congestion and edema of the lungs, and even death following prolonged exposures.