Rare, all-red auroras are produced by high-altitude oxygen, at heights of up to 200 miles. Nitrogen produces blue or purplish-red aurora. The connection between the Northern Lights and sunspot activity has been suspected since about 1880.
In developed countries, the average birth weight of a full-term newborn is approximately 3.4 kg (71â2 lb), and is typically in the range of 2.7â4.6 kg (6.0â10.1 lb).
The average newborn weighs about 3.4kg (7lb 8oz). Babies weighing more than 4kg (8lb 13oz) at birth are considered larger than average, or macrosomic (NCCWCH 2008, RCOG 2012) . If you have a very large baby, weighing 4.5kg (9lb 15oz) or more, it can put you and your baby at greater risk of certain complications.n ultrasound scan can give an idea of how big your baby really is. However, bear in mind this is not always accurate in later pregnancy. There can be a difference of about 10 per cent between your baby's weight predicted by ultrasound, and his actual weight at birth (RCOG 2012) .