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).
Quick Answer. At birth, the average newbornâs head circumference measures approximately 13 3/4 inches and grows to around 15 inches during the first month, according to the American Academy of Pediatrics. Newborn boys often have slightly larger heads than girls. The difference is typically less than 1/2 inch.