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Last Updated: January 10, References Approved. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. There are 11 references cited in this article, which can be found at the bottom of the page. This article has been viewed , times.
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Too soon for sex talk? New study shows some boys are having sex before age 13

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Single-sex education: the pros and cons

Do you have your heart set on getting pregnant with a girl? Or dreams of getting pregnant with a boy? Here's what you should know about gender selection techniques — including high-tech, low-tech and no-tech options:. With preimplantation genetic diagnosis PGD , used in conjunction with in-vitro fertilization IVF , doctors can extract one cell from the rapidly dividing embryo fertilized in the petri dish and examine it to determine gender. Only embryos of the desired sex can be implanted in the mother's uterus.
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Sex reassignment surgery (male-to-female)

Every parent of twins faces the question "Are your twins identical or fraternal? Many think that being identical twins refers to how twins look and not how they form. Take a look at the biology that determines the sex combinations that are possible with identical and fraternal twins. The terms identical and fraternal don't describe what the twins look like, but actually how they form. Identical monozygotic twins are always of the same sex because they form from a single zygote fertilized egg that contains either male XY or female XX sex chromosomes.
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Our free ovulation calendar shows your most fertile days for getting pregnant. Plans are based on the fact that, for most women, ovulation happens approximately 14 days before the next menstrual period. As ovulation approaches, your chances of getting pregnant will increase. Knowing when you ovulate will help you time intercourse that can result in getting pregnant. If you are trying for a boy or girl , the planner will also suggest some actions that may influence the sex of the child , based on the scientific research of Dr Landrum Shettles and David M.
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