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).
What Does the Average Newborn Weigh? At birth, the average baby weighs about 7.5 pounds, and 95 percent of newborns will be between 5.5 and 9.5 pounds. If your baby falls within this range at birth, thereâs probably no reason to be concerned about her size.