On October 31, 2011,  the United Nations is expected to announce a projected world population  figure of 7 billion.  This global milestone presents both an opportunity  and a challenge for the planet.  While more people are living longer  and healthier lives, says the U.N., gaps between rich and poor are  widening and more people than ever are vulnerable to food insecurity and  water shortages. Because censuses are infrequent and incomplete, no one  knows the precise date that we will hit the 7 billion mark - the Census  Bureau puts it somewhere next March.  In the last 50 years, humanity  has more than doubled. What could the next decade mean for our numbers  and the planet? In this post, we focus on births, but we'll be back with  population-related content including it's affect on the environment and  our food supply. -- Paula Nelson (47 photos total)

A  Cuban doctor inspects patient Amareli Suarez, 22, who is 36 weeks  pregnant, at a public maternity hospital in Gatire on the outskirts of  Caracas, Oct. 5, 2011. The hospital is part of the 'Barrio Adentro'  program, which is a collaboration between the governments of Venezuela  and Cuba, where highly trained Cuban doctors help provide  publicly-funded health care for poor and marginalized communities in  Venezuela. 

A  Cuban doctor covers the eyes of a premature baby in the natal intensive  care unit of a public maternity hospital in Gatire on the outskirts of  Caracas, Oct. 5, 2011. 

Cuban  doctors attend a birth as Venezuelan students watch at a public  maternity hospital in Gatire, Oct. 5, 2011. 

Obstetrician  Ana Lara carries baby Diego Alejandro, born by caesarean in the private  Aquamater clinic in Caracas, Sept. 10, 2011. Aquamater opened in 1999  and is the first centre specializing in waterbirths in Venezuela. It  aims to advise couples, who pay a fee, on techniques for breastfeeding,  pain relief and different ways of giving birth. 

Cuban  neonatologists watch over premature babies in the natal intensive care  unit of a public maternity hospital in Gatire, Oct. 5, 2011. The  hospital is part of the 'Barrio Adentro' program, which is a  collaboration between the governments of Venezuela and Cuba.

A  premature baby sleeps in an incubator in the natal intensive care unit  at a public maternity hospital in Gatire, Oct. 5, 2011. Highly trained  Cuban doctors help provide publicly-funded health care for poor and  marginalized communities in Venezuela as part of the 'Barrio Adentro'  program 

Katy,  who is 37 weeks pregnant, takes part in a prenatal course in the  swimming pool of the private Aquamater clinic in Caracas, Oct. 1, 2011.  Aquamater opened in 1999 and is the first centre specializing in  waterbirths in Venezuela. 

Katy  and her husband Facundo, practice her breathing during a swimming pool  prenatal course run by the private Aquamater clinic in Caracas, Oct. 1,  2011. 

Pregnant  couple Kerwin and Astrid, both 19 years-old, attend a prenatal course  given by the private Aquamater clinic in Caracas, Oct. 1, 2011. 

Pregnant  women exercise during a prenatal course conducted by the civil  association Nina Madre (Child Mother) in Caracas, Sept. 21, 2011. 

Pregnant  women wait for their turn to undergo a Cesarean section (c-section)  procedure at the Santa Ana public maternity hospital in Caracas, Oct.  19, 2011. 

Doctors  hold one of the newborn triplets of Yojaimi Garcia, 20, as she  undergoes a caesarean section at the Santa Ana public maternity hospital  in Caracas, Oct. 23, 2011. 

A  newborn baby is measured by a doctor minutes after he was born, inside  the childbirth unit of the Santa Ana public maternity hospital in  Caracas, Oct. 19, 2011. 

A  nurse fills baby bottles inside the child care unit at the Santa Ana  public maternity hospital in Caracas, Oct. 22, 2011. 

Idaima  Lopez, 24, pregnant with triplets, waits in a bed in a public maternity  hospital in Gatire, Oct. 5, 2011.  

A  Cuban doctor checks on a pregnant woman at a Barrio Adentro clinic in  Naiguate in the state of Vargas, Oct. 6, 2011. The Barrio Adentro'  program, which is a collaboration between the governments of Venezuela  and Cuba, brings highly trained Cuban doctors to help provide  publicly-funded health care for poor and marginalized communities in  Venezuela. 

A  mother and her newborn lay on a bed inside the childbirth unit at  hospital Escuela in Tegucigalpa, Oct. 21, 2011. The cost of having a  baby delivered at the public hospital is $10. 

The  bloodstained feet of mothers are seen after they've given birth inside  the childbirth unit at hospital Escuela in Tegucigalpa, Oct. 21, 2011. 

A  premature baby sleeps in an incubator in the natal intensive care unit  in a public maternity hospital in Gatire, Oct. 5, 2011. 

Maria  Pena, 19, carries her five day-old baby as Carmen Cartaya holds her  four day-old nephew in a public maternity hospital in Gatire, Oct. 5,  2011. 

Mothers  and newborn babies wait on beds inside the childbirth unit at hospital  Escuela in Tegucigalpa, Oct. 21, 2011. 

Newly  born babies rest inside a ward at a hospital on the occasion of "World  Population Day" in the northern Indian city Lucknow, July 11, 2009.

A baby stretches its hand from under a quilt at a local hospital in Jiaxing, Zhejiang province, Oct. 25, 2011. 

Nurses  stand around a newborn baby lying in a trolley inside a maternity ward  in Karachi, Oct. 25, 2011. 

A  nurse checks Yang Huiqing before she has a cesarean section in Ruijin  Hospital in Shanghai, Oct. 24, 2011.  Yang and her husband Chen Yiming,  both born under the one-child policy, had their first baby as the world  population was about to reach the seven billion mark. 

Chen  Yiming talks to his wife as she is carried to the operating room before  a cesarean section in Ruijin Hospital in Shanghai, Oct. 24, 2011.   China, the world's most populated country with more that 1.34 billion  people, introduced a law that limits most urban families to one child.  The policy is meant to avoid over-population, but as families shrink and  the population structure moves towards an inverted pyramid, many  demographers worry that a shrinking pool of young people won't be able  to support and care for their elders. 

A  nurse speaks to Yang Huiqing before she has a cesarean section in  Shanghai, Oct. 24, 2011.  Yang and her husband Chen Yiming, both born  under the one-child policy. 

Nurses  watch as Yang Huiqing has a cesarean section, October 24, 2011.  Yang  and her husband Chen Yiming, both born under the one-child policy, had  their first baby as the world population was about to reach the seven  billion mark. China introduced a law that limits most urban families to  one child. The policy is meant to avoid over-population. 

A  doctor holds up the newborn baby of Yang Huiqing, Oct. 24, 2011.  (Carlos Barria/Reuters)Chen Yiming waits in the lobby of the delivery  room, Oct. 24, 2011. 

Wang  Hui Qio  and Guo Hua Li, grandmothers of the newborn baby of Yang  Huiqing, celebrate the birth in Ruijin Hospital in Shanghai, Oct. 24,  2011. 

Yang  Huiqing, 26, texts her husband as she rests in the delivery room in  Ruijin Hospital in Shanghai, Oct. 24, 2011. 

Pregnant  women lie on beds while waiting to give birth in the maternity ward of  the Central Obstetrics Hospital in Hanoi, Oct. 27, 2011.

Doctors  help Le Thi Nga, 26, give birth in the maternity ward of the Central  Obstetrics Hospital in Hanoi, Oct. 27, 2011. 















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