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建立人际资源圈Multiple_Births
2013-11-13 来源: 类别: 更多范文
Multiple Births
When bearing a child there may be a possibility of having more than just one child, which is referred to as a multiple birth. A multiple birth is one in which two or more fetuses develop at one time in the uterus. This happens when a woman naturally releases more than one egg from her ovaries. Most multiple births are caused from using fertility drugs.
The most common types of multiple births are twins. Twins are categorized into different groups. The two most common types of twins are fraternal and identical.
Fraternal twins are a result of two eggs and two sperm (Segal 4). Twins can be conceived at different times when there are two separate sperm. The tendency to conceive fraternal twins seems to be heredity. Some studies show higher incidence where there is a history of twins on the mothers side of the family. Fraternal twins can be boy/girl, girl/girl, or boy/boy. Opposite sex twins make up one-third of the twin population, about one in 240 births (Wolner 32). Boy/girl twins develop as differently as single birth children from the time of conception. Fraternal twins can be conceived at the same time, but their birthdays can be days, weeks
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