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).
However, any birth weight of a term newborn between 5 lbs, 8 oz and 8 lbs, 13 oz is considered to be normal. In 2013, there were: 1  55,947 births at 1499g or less (3.3 pounds or less) 2  61,992 births from 1500g to 1999g (3.3 to 4.4 pounds)  200,908 births from 2000g to 2499g (4.4 to 5.5 pounds)