So, I'm 7 weeks along with #2, and came across a lot of interesting information yesterday regarding ultrasounds that I wasn't aware of with DD. I'll try to summarize the best I can:
Based on previous animal testing, scientists are concerned about the ultrasound exposure to fetuses and the impacts it can have on their neurological development. Basically the sound waves produce heat, and increased temperature in unborn babies has been shown in the animal studies to cause neurological and other impairments. the other specific concerns with ultrasound are that they were recently (w/in 20 years) allowed to use a much higher rate of (whatever it is they use), specific training on the safety is not required, and licenses/calibrated machines are also not required in most states (especially for the "keepsake" ultrasound places). They're wondering if this may correlate to the rise in autism during this same time frame - and saying that all around the world, it's hard to show similar other environmental factors that can account for ASD, but all of these places have ultrasound. Here's one of the more in depth stories:
Re: Ultrasound Risks - Discuss
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Additional Sources: (Again though, nothing is proven, but it's credible, and at least you can say you're informed)
https://www.fda.gov/Radiation-EmittingProducts/RadiationEmittingProductsandProcedures/MedicalImaging/ucm115357.htm
"Even though there are no known risks of ultrasound imaging, it can produce effects on the body. When ultrasound enters the body, it heats the tissues slightly. In some cases, it can also produce small pockets of gas in body fluids or tissues (cavitation). The long-term effects of tissue heating and cavitation are not known.
Because of the particular concern for fetal exposures, national and international organizations have advocated prudent use of ultrasound imaging. Furthermore, the use of diagnostic ultrasound for non-medical purposes such as fetal keepsake videos has been discouraged."
https://www.ncbi.nlm.nih.gov/pubmed/12509108
"Acoustic exposure from modern ultrasonographic devices is capable of disturbing biological tissue to varying extent depending on the type of ultrasound examination and the particular tissue under investigation. There is no strong evidence that these biological effects present a serious health hazard, however, knowledge is incomplete, particularly from human studies."
I did not have elective ultrasounds, and will not for future pregnancies.
I went down to ultrasound at least once every two weeks throughout my entire pregnancy at the request of the main technician who was teaching students. We do not have an OB unit and there were three of us pregnant at the time, so they used the three of us to help the students learn how to do fetal ultrasounds. The class ran for 8 out of the 9 months I was pregnant...and I was high risk so I had about one ultrasound every month during first trimester and one every 6 weeks during the second on TOP of the ones I was getting every two weeks at work.
And my kid is fine. My OB knew I was helping out this class and had no problems with it...and I was ordered not to swim during third trimester...so, I have a careful OB.
SCANDAL!