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A pregnancy is considered term at 37 weeks of gestation. It is preterm if less than 37 weeks and postterm at or beyond 42 weeks of gestation. American College of Obstetricians and Gynecologists have recommended further division with early term 37 weeks up to 39 weeks, full term 39 weeks up to 41 weeks, and late term 41 weeks up to 42 weeks. [25]

An estimated due date is given by Naegele's rule. According to the WHO, a preterm birth is defined as "babies born alive before 37 weeks of pregnancy are completed." [18] According to this classification, there are three sub-categories of preterm birth, based on gestational age: extremely preterm (fewer than 28 weeks), very preterm (28 to 32 ...

A pregnancy test is used to determine whether a woman is pregnant. The two primary methods are testing for the human pregnancy hormone ( human chorionic gonadotropin (hCG)) in blood or urine using a pregnancy test kit, and scanning with ultrasonography. [1] Testing blood for hCG results in the earliest detection of pregnancy. [2]

In 2012 the average global birth rate was 19.611 according to the World Bank and 19.15 births per 1,000 total population according to the CIA, compared to 20.09 per 1,000 total population in 2007. The 2021 average of 18.1 births per 1,000 total population equates to approximately 4.3 births per second or about 259 births per minute for the world.