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AUSTIN, Texas -- The pitter patter of little feet around the house. It's a dream for many couples, but that hope can often fade due to a variety of physical problems or something as simple as the timing just isn t right. However thanks to technological advances, a decades old procedure invetro fertilization is helping.

In 2008 while living in the Houston area -- Elizabeth and Bo Slone had a son thanks to invitro fertilization or IVF. Five-years later and now Austin residents-- they decided it's time for him to have a brother or sister. They knew they would once again require IVF but are amazed at the changes.

It s actually pretty incredible, said Elizabeth. Just since we had our son it s incredible how technology has advanced.

It s real fascinating, said Bo. We re both geologists so to see the scientific part of it and see that every year how different it is and changed.

The couple sought out Dr. Thomas Vaughn the IVF pioneer of Central Texas.

Vaughn -- who started the Texas Fertility Center -- performed the first invitro procedure in Austin in the early 80 s. He s not surprised a recent study by the Society of Assisted Reproductive Technology shows more than 60-thousand babies were born in this country last year due to IVF. That's nearly 2-percent of all babies.

Infertility has been increasing primarily due to delayed child bearing, so they re becoming pregnant at older ages which create problems, said Vaughn. The eggs are getting older. Women are developing problems like endometriosis and scar tissue and now have more infertility issues.

When you re doing this game the Invitro game that s what it all is, is statistics, said Bo. Who has the best statistics? Are they increasing over time? You go back and look at the historical data of the doctors involved and it s getting better and better.

Vaughn says the most important IVF statistic doesn t involve an increase.

As things get better-- laboratories get better the multiple birth rate is declining, he said.

Vaughn says the declining multiple birth rates are a direct result of technology which allows doctors to transfer fewer embryos and still enjoy a high pregnancy success rate. Success enjoyed by the Slones for a second time. They re expecting a girl in June.

Here s a link to Texas Fertility Center: http://txfertility.com/

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