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).
Average Newborn Weight Range. If your newborn weighs between 5.5 and 10 pounds at birth, she's within the average range of weight. According to Heidi Murkoff, author of the bestselling pregnancy book What to Expect When You're Expecting, 95 percent of newborn babies fall into this range. The average baby weighs 7.5 pounds. If a baby is born who weighs less or more than the average weight range, she may receive a little extra attention from medical staff to make sure she has no health problems.