was your u/s weight estimate close? - Page 2 - Mothering Forums

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#31 of 54 Old 04-08-2010, 12:52 PM
 
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I had an u/s the morning that Corbin was born. They guessed 9 lbs 2 oz. He was 10 lbs 7 oz.

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#32 of 54 Old 04-08-2010, 01:45 PM
 
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I wanted to thank everyone who commented in this thread, because I've been contemplating getting an ultrasound around 38 weeks to check size. I've had an 11 lber and a serious shoulder dystocia, and lost one twin this pregnancy so I'm very jittery.

Given just how off the majority of these scans were, I'm not going to do it. My own feeling on this baby is that she is quite small (fundal heights concur with that estimation), so I'm going to trust that and not give myself the opportunity to get all worked up over data that could be very very off.

Thanks!

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#33 of 54 Old 04-08-2010, 01:50 PM
 
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Mine was way off with my baby born Christmas Eve! Estimated at 9lb 11oz December 18. She weighed 8 lbs even on the 24th.

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#34 of 54 Old 04-08-2010, 02:26 PM - Thread Starter
 
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Thanks for sharing everyone!
It's interesting.

I wonder what evidence there is to support the practice of using ultrasound to estimate fetal weight.

The u/s tech here explained to me that they measure the head, the abdomen and the femur and that this is the basis of the weight estimate. It hardly seems even from a layperson's perspective that these three measurements could accurately predict the weight of a baby.

I'm not sure how these would vary with experience of the technician. They are such simple measurements. I call the procedure itself into deeper question as I can't wrap my head around how the weight can be accurately measured by those three measurements.

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#35 of 54 Old 04-08-2010, 03:26 PM
 
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I've only had one fairly close to the birth (had baby Friday morning, and u/s was Wednesday afternoon). The u/s estimate was 8lb. 13oz. DD2 was 10lb. 2oz. So...not very close, imo.

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#36 of 54 Old 04-08-2010, 05:04 PM
 
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Originally Posted by bri276 View Post
Do OBs say anything when this kind of thing happens? Like...."Oops!" or do they just act like nothing happened?
I believe that acting like nothing happened was about what she got. I would have been seriously pissed.
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#37 of 54 Old 04-08-2010, 09:42 PM
 
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DD1: 1 week before delivery, est 6lb1oz...7 days later, 8lb 2oz
DD2: 3 weeks before delivery they estimated less than 6lb....8lb9oz

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#38 of 54 Old 04-09-2010, 01:14 AM
 
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I had an ultrasound the morning I went into labour. The estimate was 8lbs 8oz & ds was 8lbs 9oz, so pretty darn close.

Surviving sleep deprivation one day at a time with dd (Oct '11) & ds (Oct '08).

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#39 of 54 Old 04-09-2010, 11:33 AM
 
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omg for real? wow that board line term for some babies. how awful.
Yep, that's what they did! And everyone was so surprised when she had breathing problems and ended up needing lots of help breathing for the first day. I'm happy to say that she's okay now, but come on people!

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#40 of 54 Old 04-09-2010, 12:32 PM
 
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I had an u/s at 39 weeks that said DD was 5lbs7oz. 30 hours later, I had another BPP that said she was 7lbs8oz. The hospital still claimed she was IUGR. She was born 4 hours later at 6lbs12oz.
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#41 of 54 Old 04-09-2010, 03:46 PM
 
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I was told DS was 6 1/2 pounds 2 weeks before he was born. He was 9 lbs, 9 ounces. Either he gained 3 pounds during those last 2 weeks, or the scan was off.
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#42 of 54 Old 04-10-2010, 10:09 PM
 
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Nope, not close. DD1 was supposed to be 10lbs +. She weighed 8lbs. 13oz. I didn't do an u/s at all with DD2. She was 11lbs.

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#43 of 54 Old 04-10-2010, 10:19 PM
 
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Quote:
Originally Posted by bri276 View Post
Do OBs say anything when this kind of thing happens? Like...."Oops!" or do they just act like nothing happened?
While my situation was not quite such a drastic difference, I still feel like it was enough to have been talked about. My OB just said Congratulations and walked out of the room. I didn't see her again, ever (7 doc practice).

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#44 of 54 Old 04-11-2010, 02:44 PM
 
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Hmmmm.... dd1 was a 42+ week babe and was 9lbs6oz at birth. There were pregnancy complications that resulted in several u/s. I think the 40wk u/s put her at about 9lbs so they were pretty close.

DD2 was a simpler pregnancy so only one u/s scan was done. The ob used palpation and thought she'd be about 8lbs. She was born at 40wks and was 9lbs even (however she developed shoulder dystocia and it was a bit hairy for a while).

DS had several u/s due to my birth history. I had an u/s about 24 hours before he was born (at 42 weeks) that put him at 9lbs12oz. He was 9lbs8oz so that was more or less spot on.

Each babe was born under the care of a different provider, the u/s were all done at different facilities. So in my case at least the u/s was more accurate than the palpation. But that said, u/s for weight is so unreliable...

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#45 of 54 Old 04-11-2010, 03:08 PM
 
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Originally Posted by wombatclay View Post
Hmmmm.... dd1 was a 42+ week babe and was 9lbs6oz at birth. There were pregnancy complications that resulted in several u/s. I think the 40wk u/s put her at about 9lbs so they were pretty close.
To me, that sounds pretty off. If she was 9lbs at 40 weeks and had over two more weeks to grow, you'd expect her to have been between 10-10.5 lbs, that's a whole pound off.

If you look, u/s is supposed to be correct at estimating birth with something like +/- 20-25%. To me, that's just about worthless.

SIL had a planned c-section on a Monday at 36 weeks. The Friday before they estimated the baby at 7lb 12oz. She was born at 6lb 12oz. This was a child who was going to go straight into daycare and was born in November. She ended up hospitalized for RSV that winter and I can't help but think if she had gotten to cook a little longer she would have been better off.

My sister was encouraged to have a c-section because the baby was so big, 9+ lbs. She was 7lb 6oz, I think--- definately no bigger. Then she had a c-section with her next because she *obviously* couldn't have a vaginal birth

 

 

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#46 of 54 Old 04-11-2010, 03:18 PM
 
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I had an u/s hours before my (emergent) c-section with DS (32 weeks 4 days). He was estimated at 2044 grams and came out weighing 2040 grams (4 lbs 8 oz). I assume that it's an easier estimate earlier in the pregnancy like that, though.

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#47 of 54 Old 04-11-2010, 03:32 PM
 
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Not close.

My u/s estimates for both babies was 9+ pounds. DD#1 was 7lbs, 11oz. DD#2 was 8lbs, 3oz.

I wish they hadn't estimated for me because they made me very afraid - several people, the u/s tech, midwives and a doula - about how large my babies were so I went into labor with a lot of fear. Turns out I didn't need to be so worried.
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#48 of 54 Old 04-11-2010, 03:35 PM
 
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I had an ultrasound on a Friday, and had my son on the following Monday. At the Friday ultrasound, they guessed him to be "around" 8 lbs. My doctor (who does the u/s herself) said "8, 8.5, around there." He was 9 lbs when he was born.

So not spot on, but it was pretty close for us.

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#49 of 54 Old 04-11-2010, 09:09 PM
 
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To me, that sounds pretty off. If she was 9lbs at 40 weeks and had over two more weeks to grow, you'd expect her to have been between 10-10.5 lbs, that's a whole pound off.
'Cept that fetal weight gain tends to slow towards the end of pregnancy. Gaining a half lb a week at 40-42 weeks would be unusual. Which is one reason the whole "oh, this babe will be huge" arguement drives me nuts. Care providers know a babe isn't going to be growing all that fast after 40 weeks, and they know u/s can be off by a pound or more, so try to scare a mom into an induction or a cesarean because the babe will be too big if they don't "do something now"? Grrrrr!

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#50 of 54 Old 04-11-2010, 09:34 PM
 
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My neighbor was just induced at 37 weeks because the doctors were telling her that the baby was already well over 8 pounds and would be huge if they didn't induce her early. Baby was born and was 6 pounds 1 oz.
This happened to me with DS!!

The ultrasound the morning of my induction (amnio is requried for a 37 week induction) put him at 9lbs. He was born the next evening via c-section for failed induction weighing 5lbs 11 oz... Boy was I one pissed mama... I didn't know that US has such a tendency to be wrong!

I had an US with DD at 41 weeks and they said 8.5 lbs. She was born at 41.5 weeks weighing 7lbs 9.3oz (hugely inflated though as they pumped a TON of fluid in me when they decided to c-section me at 9CM and +1 station because she 'was going to get stuck' so her more true weight is probably 7lbs 3 oz as she was at 24 hrs).

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#51 of 54 Old 04-11-2010, 10:27 PM
 
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DD2 was estimated at 10lb, 6oz on a Friday, though the tech said they're usually about 1/3lb high on late term u/s and said 10lb even was more likely. She was born that Sunday at 41w @ 9lb, 8oz and 22". I think length can skew weight estimates, too, since in many cases both humerus and femur play into the calculation.

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#52 of 54 Old 04-11-2010, 10:34 PM
 
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i only had ultrasounds with my first pregnancy because they suspected IUGR
her estimated birth weight, in the last week of pregnancy was 5 lbs. she was 6 lbs 15 oz.

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#53 of 54 Old 04-11-2010, 10:39 PM
 
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I had an u/s at 33 weeks that put him at almost 7 pounds. He was born at 36 weeks and was one ounce under 7 pounds. They were telling me that he would be huge by my due date and they would have to induce early. I think the truth was that the earlier ultra sound at 18 weeks got the date wrong and he was actually born more likely at 39 weeks. My second was born at 39 weeks and was only a few ounces bigger.

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#54 of 54 Old 04-12-2010, 12:51 AM
 
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At 34 weeks they were estimating he would be a good 9 pounds by 38-39 weeks.

I had an awful induction at 39 weeks "because we don't want a BIG baby! Nothing good comes from that!"

He was 7 pounds even.

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