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 body length of newborn â 14ââ-20ââ (35.6cms â 50.8cms). There is a little difference in length and weight of boy baby and girl baby. Average length of male baby is 50.6 cms. and that of female baby is 50.1cms. 4% babies are born below 46 cms of length.