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Fertility and infertility is respectively, the ability and inability of a human couple to conceive and reproduce.Fertilityrefers to the ability to become pregnant through normal sexual activity, andinfertilityis defined as the failure to conceive after one year of regular intercourse without contraception; approximately 80 percent of healthy fertile women are able to conceive during this period. Infertility can affect either the male or the female partner and can result from a number of causes. About one in every eight couples is infertile [see Pregnancy Miracle Book ].

Normal fertility depends on theproduction of a sufficient number of healthy, motile sperm by the male, delivery of those cells through open pathwaysinto the vagina, successful passage of the spermthrough the uterus and into the fallopian tubes, and penetration of a normal ovum (egg) by one of the sperm.

A successful pregnancy alsorequires that the fertilized ovum subsequently become implanted in the lining of the female uterus. A defect at any one of these stages can result in a couple's infertility.

Early efforts in the field of fertility management were aimed at preventing unwanted conception, and technological advances in the second half of the 20th century have made this a usually achievable goal. The reverse situation, inability to conceive when desired, has been a problem throughout recorded history.

Many kinds of infertility have responded to new medical management methods in the late 20th century, however. One of the most highly celebrated groups of people who successfully succeeded in managing infertility is the Chinese. Using their old age method, documented in The Pregnancy Miracle, they caged infertility.

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