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Re: How accurate our ultrasounds for the weight of a baby?From: Traci (anonymous@obgyn.net)Sat, 27 Apr 2002 23:45:44 -0500 (CDT)
At Sat, 27 Apr 2002, Denise wrote: > >I had an ultrasound at 36 wks 4 days and the ultrasound predicted my >baby to be about 6 1/2 pounds. Well my daughter was born at my 36th >week and I was wondering if this weight is that accurate. They are >predicting a 9 pound baby or so. My first child was 9 lbs. 14 ozs. and >the doctor thought he would be only 7 pounds. Of course this is the >first time I have had an ultrasound this late in pregnancy, but I am >very curious if it could be wrong. Ultrasounds are not as accurate in late pregnancy as they are earlier on. I've also heard that the weights could be off by a lb or 2, however, that's not always accurate. An u/s at 36wks on my little sister said that the baby was going to be over 9lbs based on the measurements, but at birth, he was only 5lbs 6oz!! That's a HUGE difference. (though I'm sure that's not common to be off that much) He was a longer baby for his weight, so we are thinking that is where the mistake came from. Avg weight gain I believe for a baby in the last weeks is a half a lb per week, so if you figure that, baby would be around 8-8 1/2lbs.
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