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Katy, who is 37 weeks pregnant, takes part in a prenatal course in the swimming pool of the private Aquamater clinic in Caracas October 1, 2011. Aquamater opened in 1999 and is the first centre specialising 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 1, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY IMAGE OF THE DAY TOP PICTURE)

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Katy, who is 37 weeks pregnant, and her husband Facundo practice her breathing during a swimming pool prenatal course run by the private Aquamater clinic in Caracas October 1, 2011. Aquamater opened in 1999 and is the first centre specialising 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 1, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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Katy, who is 37 weeks pregnant, and her husband Facundo practice her breathing during a prenatal course run in the swimming pool of the private Aquamater clinic in Caracas October 1, 2011. Aquamater opened in 1999 and is the first centre specialising 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 1, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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Katy, who is 37 weeks pregnant, takes part in a prenatal course in the swimming pool of the private Aquamater clinic in Caracas October 1, 2011. Aquamater opened in 1999 and is the first centre specialising 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 1, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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Katy, who is 37 weeks pregnant, and her husband Facundo practice her breathing during a swimming pool prenatal course run by the private Aquamater clinic in Caracas October 1, 2011. Aquamater opened in 1999 and is the first centre specialising 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 1, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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Katy and her husband Facundo practice her breathing during a swimming pool prenatal course run by the private Aquamater clinic in Caracas October 1, 2011. Aquamater opened in 1999 and is the first centre specialising 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 1, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY IMAGE OF THE DAY TOP PICTURE)

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Clotilde Boutin of France carries her new born baby as she looks at her Venezuelan husband Antero Alvarado at the private Aquamater clinic in Caracas September 23, 2011. Aquamater opened in 1999 and is the first centre specialising 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken September 23, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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Obstetrician Ana Lara carries baby Diego Alejandro born by caesarean in the private Aquamater clinic in Caracas September 10, 2011. Aquamater opened in 1999 and is the first centre specialising 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken September 10, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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A pediatrician inspects baby Marcelino Alvarado minutes after he was born in the private Aquamater clinic in Caracas September 23, 2011. Aquamater opened in 1999 and is the first centre specialising 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken September 23, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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Pregnant couple Kerwin and Astrid, both 19 years-old, attend a prenatal course given by the private Aquamater clinic in Caracas October 1, 2011. Aquamater opened in 1999 and is the first centre specialising 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 1, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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Idaima Lopez, 24, pregnant with triplets, waits in a bed in a public maternity hospital in Gatire on the outskirts of Caracas October 5, 2011. The hospital is part of the 'Barrio Adentro' programme, 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 5, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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A Cuban doctor inspect patient Amareli Suarez, 22, who is 36 weeks pregnant, at a public maternity hospital in Gatire on the outskirts of Caracas October 5, 2011. The hospital is part of the 'Barrio Adentro' programme, 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 5, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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A Cuban doctor cover the eyes of a premature baby in the natal intensive care unit of a public maternity hospital in Gatire on the outskirts of Caracas October 5, 2011. The hospital is part of the 'Barrio Adentro' programme, 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 5, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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A premature baby sleeps in an incubator in the natal intensive care unit in a public maternity hospital in Gatire on the outskirts of Caracas October 5, 2011. The hospital is part of the 'Barrio Adentro' programme, 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 5, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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Maria Pena (R) 19 carries her five day-old baby as Carmen Cartaya looks at her four day-old nephew in a public maternity hospital in Gatire on the outskirts of Caracas October 5, 2011. The hospital is part of the 'Barrio Adentro' programme, 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 5, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY IMAGE OF THE DAY TOP PICTURE)

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Cuban neonatologists watch over premature babies in the natal intensive care unit of a public maternity hospital in Gatire on the outskirts of Caracas October 5, 2011. The hospital is part of the 'Barrio Adentro' programme, 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 5, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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A Cuban doctor checks on a pregnant woman at a Barrio Adentro clinic in Naiguate in the state of Vargas, October 6, 2011. The Barrio Adentro' programme, 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 6, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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A premature baby sleeps in an incubator in the natal intensive care unit at a public maternity hospital in Gatire on the outskirts of Caracas October 5, 2011. The hospital is part of the 'Barrio Adentro' programme, 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 5, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)

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Cuban doctors attend a birth as Venezuelan students look on at a public maternity hospital in Gatire on the outskirts of Caracas October 5, 2011. The hospital is part of the 'Barrio Adentro' programme, 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. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken October 5, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY)