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).
A. The average weight for a newborn is 2.5 - 4 kilos. A baby that weighs less than 2.5 kilos is considered 'small for gestational age' and a baby that is born over 4 kilos is considererd 'large for gestational age'.