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Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic, meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell. Since identical twins develop from one zygote, they will share the same sex, while fraternal twins may or may not. In very rare cases twins can have the same mother and different fathers.
A multiple birth is the culmination of one multiple pregnancy, wherein the mother gives birth to two or more babies. A term most applicable to vertebrate species, multiple births occur in most kinds of mammals, with varying frequencies. Such births are often named according to the number of offspring, as in twins and triplets. In non-humans, the whole group may also be referred to as a litter, and multiple births may be more common than single births. Multiple births in humans are the exception and can be exceptionally rare in the largest mammals.
Development of the human body is the process of growth to maturity. The process begins with fertilization, where an egg released from the ovary of a female is penetrated by a sperm cell from a male. The resulting zygote develops through mitosis and cell differentiation, and the resulting embryo then implants in the uterus, where the embryo continues development through a fetal stage until birth. Further growth and development continues after birth, and includes both physical and psychological development that is influenced by genetic, hormonal, environmental and other factors. This continues throughout life: through childhood and adolescence into adulthood.
Fertility in colloquial terms refers the ability to have offspring. In demographic contexts, fertility refers to the actual production of offspring, rather than the physical capability to reproduce, which is termed fecundity. The fertility rate is the average number of children born during an individual's lifetime. In medicine, fertility refers to the ability to have children, and infertility refers to difficulty in reproducing naturally. In general, infertility or subfertility in humans is defined as not being able to conceive a child after one year of unprotected sex. The antithesis of fertility is infertility, while the antithesis of fecundity is sterility.
The female reproductive system is made up of the internal and external sex organs that function in the reproduction of new offspring. The human female reproductive system is immature at birth and develops to maturity at puberty to be able to produce gametes, and to carry a fetus to full term. The internal sex organs are the vagina, uterus, fallopian tubes, and ovaries. The female reproductive tract includes the vagina, uterus, and fallopian tubes and is prone to infections. The vagina allows for sexual intercourse and childbirth, and is connected to the uterus at the cervix. The uterus or womb accommodates the embryo, which develops into the fetus. The uterus also produces secretions, which help the transit of sperm to the fallopian tubes, where sperm fertilize ova produced by the ovaries. The external sex organs are also known as the genitals and these are the organs of the vulva including the labia, clitoris, and vaginal opening.
Ectogenesis is the growth of an organism in an artificial environment, outside the body in which it would normally be found, such as the growth of an embryo or fetus outside the mother's body, or the growth of bacteria outside the body of a host. The term was coined by British scientist J. B. S. Haldane in 1924.
Assisted reproductive technology (ART) includes medical procedures used primarily to address infertility. This subject involves procedures such as in vitro fertilization (IVF), intracytoplasmic sperm injection (ICSI), cryopreservation of gametes or embryos, and/or the use of fertility medication. When used to address infertility, ART may also be referred to as fertility treatment. ART mainly belongs to the field of reproductive endocrinology and infertility. Some forms of ART may be used with regard to fertile couples for genetic purpose. ART may also be used in surrogacy arrangements, although not all surrogacy arrangements involve ART. The existence of sterility will not always require ART to be the first option to consider, as there are occasions when its cause is a mild disorder that can be solved with more conventional treatments or with behaviors based on promoting health and reproductive habits.
Fetal viability is the ability of a human fetus to survive outside the uterus. Viability depends upon factors such as birth weight, gestational age, and the availability of advanced medical care. In low-income countries, more than 90% of extremely preterm newborns die due to a lack of said medical care; in high-income countries, the vast majority of these newborns survive.
Surrogacy is an arrangement, often supported by a legal agreement, whereby a woman agrees to childbirth on behalf of another person(s) who will become the child's parent(s) after birth. People pursue surrogacy for a variety of reasons such as infertility, dangers or undesirable factors of pregnancy, or when pregnancy is a medical impossibility.
Pregnancy is the time during which one or more offspring develops (gestates) inside a woman's uterus (womb). A multiple pregnancy involves more than one offspring, such as with twins.
Prenatal development involves the development of the embryo and of the fetus during a viviparous animal's gestation. Prenatal development starts with fertilization, in the germinal stage of embryonic development, and continues in fetal development until birth.
Human reproduction is sexual reproduction that results in human fertilization to produce a human offspring. It typically involves sexual intercourse between a sexually mature human male and female. During sexual intercourse, the interaction between the male and female reproductive systems results in fertilization of the ovum by the sperm to form a zygote. While normal cells contain 46 chromosomes, gamete cells only contain 23 single chromosomes, and it is when these two cells merge into one zygote cell that genetic recombination occurs and the new zygote contains 23 chromosomes from each parent, giving it 46 chromosomes. The zygote then undergoes a defined development process that is known as human embryogenesis, and this starts the typical 9-month gestation period that is followed by childbirth. The fertilization of the ovum may be achieved by artificial insemination methods, which do not involve sexual intercourse. Assisted reproductive technology also exists.
A fetus or foetus is the unborn offspring that develops from a mammal embryo. Following embryonic development, the fetal stage of development takes place. In human prenatal development, fetal development begins from the ninth week after fertilization and continues until the birth of a newborn. Prenatal development is a continuum, with no clear defining feature distinguishing an embryo from a fetus. However, a fetus is characterized by the presence of all the major body organs, though they will not yet be fully developed and functional and some not yet situated in their final anatomical location.
The beginning of human personhood is the moment when a human is first recognized as a person. There are differences of opinion as to the precise time when human personhood begins and the nature of that status. The issue arises in a number of fields including science, religion, philosophy, and law, and is most acute in debates relating to abortion, stem cell research, reproductive rights, and fetal rights.
María del Carmen Bousada de Lara was a Spanish woman who gained worldwide attention when, at the age of 66, she became the world's oldest mother on 29 or 30 December 2006, when she gave birth to twins. She later became an outspoken advocate for the rights of older mothers and a subject of considerable controversy.
Muslim views on abortion are shaped by Hadith, as well as by the opinions of legal and religious scholars and commentators. The Quran does not directly address intentional abortion, leaving greater discretion to the laws of individual countries. Although opinions among Islamic scholars differ over when a pregnancy can be terminated, there are no explicit prohibitions on a woman's ability to abort under Islamic law.
A Child Is Born is a 1965 photographic book by Swedish photojournalist Lennart Nilsson. The book consists of photographs charting the development of the human embryo and fetus from conception to birth; it is reportedly the best-selling illustrated book ever published. Nilsson's photographs are accompanied by text, written by doctors, describing prenatal development and offering advice on antenatal care. The images were among the first of developing fetuses to reach a wide popular audience. Their reproduction in the April 30, 1965, edition of Life magazine sparked so much interest that the entire print run of eight million copies sold out within four days; they won Nilsson the American National Press Association Picture of the Year award, and reached a sufficiently iconic status to be chosen for launch into space aboard the NASA probes Voyager 1 and Voyager 2. The book and its images have figured in debates about abortion and the beginning of life, and the book is the subject of a substantial body of feminist critique.
Prenatal nutrition addresses nutrient recommendations before and during pregnancy. Nutrition and weight management before and during pregnancy has a profound effect on the development of infants. This is a rather critical time for healthy development since infants rely heavily on maternal stores and nutrient for optimal growth and health outcome later in life.
Definitions of abortion vary from one source to another. Abortion has many definitions that can differ from each other in significant ways. Given the contentious nature of abortion, lawmakers and other stakeholders often face controversy in defining abortion. Language referring to abortion often reflects societal and political opinions . Influential non-state actors like the United Nations and the Roman Catholic Church have also engendered controversy over efforts to define abortion.
Departurism is an anti-abortion libertarian approach to the reproductive rights controversy developed by American philosopher Sean Parr which argues, contrary to evictionism, that the lethal removal of an unwanted fetus ought to be legally impermissible.
References
- ↑ "Romanian woman gives birth at 66". BBC News. 16 January 2005. Retrieved 6 June 2023.
- 1 2 "Romanian professor, 67, expects twins". China Daily. 7 January 2005. Retrieved 6 June 2023.
- 1 2 "'World's oldest mother'... at 66". CNN. Associated Press. 17 January 2005. Archived from the original on 26 January 2005.
- ↑ Philipkoski, Kristen (19 January 2005). "No Magic for Older Moms". Wired. Archived from the original on 21 January 2005.
- ↑ "'World's oldest mother'... at 67". CNN. Associated Press. 16 January 2005. Archived from the original on 26 January 2005. Retrieved 16 January 2005.
- ↑ "Your view: Mother at 67". telegraph.co.uk. 17 January 2005. Archived from the original on 18 December 2005.
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