The oxygen content of the Martian atmosphere is only 0.13 percent, compared with 21 percent in Earth's atmosphere. Carbon dioxide makes up 95.3 percent of the gas in the atmosphere of Mars. It also contains nitrogen and argon and very small amounts of water and methane.
On average babies double their birth weight by 4 months; triple their birth weight by 12 months and will be around four times their birth weight by 2 years. (Some babies will reach these levels at a much younger age. Some at a much older age. The most rapid period of growth is between 2 weeks and 6 months of age. This rate of growth decline slightly at around the age of 6 month; declines further around 9 months and declines further still at around 12 months. (These ages can vary depending on each individual baby.)
By age 2, growth in height usually continues at a fairly steady rate of about 2Â½ inches (6 centimeters) per year until adolescence. No child grows at a perfectly steady rate throughout this period of childhood, though. Weeks or months of slightly slower growth alternate with mini growth spurts in most children. Kids actually tend to grow a bit faster in the spring than during other times of the year! A major growth spurt happens at the time of puberty, usually between 8 to 13 years of age in girls and 10 to 15 years in boys. Puberty lasts about 2 to 5 years.