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 birth weight for babies is around 7.5 lb (3.5 kg) , although between 5.5 lb (2.5 kg) and 10 lb (4.5 kg) is considered normal. In general: 1  Boys are usually a little heavier than girls.n the first month, the typical newborn gains about 0.7 oz (20 g) a day, or about 4 oz (110 g) to 8 oz (226.8 g) a week. The average length of full-term babies at birth is 20 in. (50 cm) , although the normal range is 18 in. (45.7 cm) to 22 in.