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2. Maternal physiological changes in pregnancy - Wikipedia

   en.wikipedia.org/wiki/Maternal_physiological...

   These are normal physiological adaptations that cause changes in behavior, the functioning of the heart, blood vessels, and blood, metabolism including increases in blood sugar levels, kidney function, posture, and breathing. During pregnancy numerous hormones and proteins are secreted that also have a broad range of effects.

3. Human sex ratio - Wikipedia

   en.wikipedia.org/wiki/Human_sex_ratio

   In humans, the natural sex ratio at birth is slightly biased towards the male sex. It is estimated to be about 1.05 [1] or 1.06 [2] or within a narrow range from 1.03 to 1.06 [3] males per female. The sex ratio for the entire world population is approximately 101 males to 100 females (2020 est.).

4. Age and female fertility - Wikipedia

   en.wikipedia.org/wiki/Age_and_female_fertility

   Age and female fertility. Female fertility is affected by age and is a major fertility factor for women. A woman's fertility is in generally good quality from the late teens to early thirties, although it declines gradually over time. [1] Around 35, fertility is noted to decline at a more rapid rate. [1] At age 45, a woman starting to try to ...

5. Total fertility rate - Wikipedia

   en.wikipedia.org/wiki/Total_fertility_rate

   A 2023 map of countries by fertility rate. Blue indicates negative fertility rates. Red indicates positive rates. The total fertility rate (TFR) of a population is the average number of children that are born to a woman over her lifetime, if they were to experience the exact current age-specific fertility rates (ASFRs) through their lifetime, and they were to live from birth until the end of ...

6. Here's the Income You Need to Be in the Top 50% of ... - AOL

   www.aol.com/heres-income-top-50-american...

   55 to 64. $90,640. 65 and older. $54,710. All respondents. $80,610. Data source: U.S. Census Bureau. As shown, the median income across all households was $80,610 in 2023. Households represented ...

7. Female infertility - Wikipedia

   en.wikipedia.org/wiki/Female_infertility

   A woman's fertility is affected by her age. The average age of a girl's first period is 12–13 (12.5 years in the United States, [4] 12.72 in Canada, [5] 12.9 in the UK [6]), but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, 50% in the third and 10% in the sixth year. [7]