Jul 20 2014

Who is the father of my baby?

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This is a question that is asked more often than you might expect. Research is showing that between 3% and 5% of children are unknowingly raised by men that are not their biological fathers.

How does this happen?

* It is very often when a woman changes partners. Sex are often used as a tool to try to save the old relationship. The woman may get pregnant and then move on to a new partner without even knowing that she is pregnant already. In the time when one relationship moves on to a new relationship, she is also sometimes sexually involved with both men. For whatever reason, a woman will often have sex with her ex after the new relationship is started.

* Stranger or date rape. Often while she is drunk at a party.

* Cheating. Yes, it happens.

* Casual sex/One night stand – Yes, even this happens

* Friends with benefits

* Sex work

If there is any doubt, a paternity test can be done if the DNA of the baby and the father is available. Some paternity tests can be done before the baby is born, but it poses a slight risk to the baby.

There are however often clues as to when she got pregnant. That will at least narrow down the possibilities. For example, if she had her period inbetween, she likely got pregnant after her period. If the baby is a month old, it is unlikely that sex a week or 2 months ago got her pregnant. If one man used a condom, he is less likely to be the father, if one mane is sterilized, he is unlikely to be the father.

The first step is to write down the details:

The date of the last known menstrual period (LMP) and the period before that.

When did she expect her next period.

When did she have sex and with whom? What percautions were taken?

When did she get a positive pregnancy test?

What was the results from the first ultrasound? Was it a transvaginal or normal scan.

The best chance to determine paternity is with an accurate trans vaginal dating scan around week 6. Women are often confused by the gestational age derived from the ultra sound. This is because the gestationa age starts 2 weeks before conception, not at conception. The safest way is to use the estimated due date (EDD), put that into a pregnancy calculator and get the estimated conception/ovulation date.

For all practical purposes, the ovulation and conception date is one and the same. The egg will stay viable for conception at the very most for 24 hours, often much less, in the 8 to 10 hour range. So for practical purposes, a woman’s conception and ovulation date is one and the same.

If the EDD is not available, the gestational age (GA) should be used. Both these dates should map to the same conception date, but care should be taken not to confuse the fetal age (FA) with the gestational age (GA).

If there was not at least 7 days difference between the possible baby making sex with the different men, this method becomes even more difficult and inaccurate.

Category: Fertility, Pregnancy

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