In Korea, China, Japan and Vietnam, age is measured starting from conception to acknowledge that the fetus exists within the woman's body before it is born. Therefore, a newborn baby is considered to be one year old, although gestation is approximately 9 months.
The ancient Mayan calendar of 276 days possibly originated from the human gestational cycle, or to indicate the world was created as slowly as a fetus develops.
There are likewise finer distinctions between the concepts of fertilization and the actual state of pregnancy, which starts with implantation. In a normal pregnancy, the fertilization of the egg usually will have occurred in the Fallopian tubes or in the uterus. (Often, an egg may become fertilized yet fail to become implanted in the uterus.) If the pregnancy is the result of in-vitro fertilization, the fertilization will have occurred in a Petri dish, after which pregnancy begins when one or more zygotes implant after being transferred by a physician into the woman's uterus.
In the context of political debates regarding a proper definition of life, the terminology of pregnancy can be confusing. The medically and politically neutral term which remains is simply "pregnancy," though this can be problematic as it only refers indirectly to the embryo or fetus. In the context of personal treatment, bedside manner generally dictates that doctors make sparse use of clinical language like "fetus" and "embryo," and instead simply use the word "baby."
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Information on this website has been sourced from Wikipedia contributors. Pregnancy. Wikipedia, The Free Encyclopedia. www.wikipedia.org