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From early on in pregnancy, babies grow at different rates, so these numbers are merely averages. Your baby's actual length and weight may vary substantially. Don't worry too much if an ultrasound ...
www.babycenter.com/average-fetal-length-weight-chart
Upside: Detailed chart on average fetal length and weights by week
Downside: Busy page
When are scans usually carried out? Can the scan show the gender of my baby?
www.baby2see.com/medical/ultrasound.html
Upside: Very good information on ultrasounds including when to have one and learning the gender of your baby
Downside: None
radiology.creighton.edu/fetalbio.htm
Upside: Shows ultrasound pictures and how they are used for assessing fetal development
Downside: Medical language
After the first trimester of pregnancy a multiparameter assessment of gestational age is advocated. This should include at least two fetal measurements (usually biparietal diameter (BPD) and femur ...
www.baby2see.com/medical/charts.html
Upside: Excellent charts for various fetal measurements
Downside: Scroll down to see all the charts
What is ultrasound? * to evaluate movement, tone, and breathing, * to identify sex (not 100% reliable), * to assess the amount of amniotic fluid, * as an adjunct to cervical cerclage or suture, * to ...
www.i-am-pregnant.com/encyclopedia/U/Ultrasound/
Upside: Detailed explanation on having an ultrasound and 3D/4D ultrasounds with community comments
Downside: Small font; user postings may not be right for you
I had an early ultrasound at 10w5d. The u/s said I was 10w3d. Now to me that is very accurate. I was high risk and was measured quite often by numerous doctors and u/s techs and my due date was never ...
answers.yahoo.com/question/index?qid=20071227165553AAG7KMg
Upside: Answers to user generated question on how accurate an ultrasound is
Downside: Range of various answers
A pregnancy ultrasound is a method of seeing the fetus and female pelvic organs during pregnancy. The ultrasound machine sends out high-frequency sound waves. These waves bounce off body structures ...
www.healthline.com/adamcontent/pregnancy-ultrasound
Upside: Very good overview of ultrasounds including how performed, preparation, risks and more
Downside: Cluttered page
Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) ...
en.wikipedia.org/wiki/Ultrasound
Upside: Excellent user-compiled detail on ultrasounds including
some pregnancy-related information and pictures
Downside: None
This factsheet is for women who are having an ultrasound scan during pregnancy. Ultrasound is used to monitor your baby's development and check for physical abnormalities.
hcd2.bupa.co.uk/fact_sheets/html/ultrasound.html
Upside: Information on ultrasound procedure and its safety
Downside: None
If you're pregnant, chances are you'll have an ultrasound at some point. Read the answers to these commonly asked questions to learn what ultrasounds are, why they're necessary, and what they feel ...
health.discovery.com/centers/pregnancy/americanbaby/ultrasounds.html
Upside: Good overview of ultrasounds, why they are done and how to prepare
Downside: Small font