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How accurate is the baby's weight in an ultrasound??

gobbo1985gobbo1985 member
in 3rd Trimester
So I had an ultrasound at 35 weeks at they said the baby was around 5lbs and then I had one today at 39w 4days and the said the baby was 8.5lbs!! First they said it was a small/average baby and now it's a big baby.

I'm hoping this baby is late, and I'm wondering was the ultrasound correct for you on the baby's weight?
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Re: How accurate is the baby's weight in an ultrasound??

  • mcgeevamcgeeva member
    My doctor said when they did my ultra sound last week the weight could be off up or down a pound. All a guess is how I see it

    Married: 5/09 ~ TTC Since: 10/10 ~ PCOS ~ Progesterone from 10/10 - 2/11 ~ HSG on 3/18 - Clear ~ Started Metformin 1000mg & Clomid 50mg 2/11 ~ Metformin upped to 1500mg 4/6 ~ 6/7 Now going to SG and put on Clomid, Ovidrel, Gonal F, Prometrium, Estrace ~ IUI #1 7/2 = BFP!!!!!! March 6th our little man was born. 

    6/17/13 - Ovidrel, Follistim, Prometrium ~ IUI #1 7/2 = BFP! March 17th our St. Pattys day baby arrived

    10/29/17 - Started process for IVF, got pregnant & miscarried a 2nd time since summer. 2/22 started stims - Menopur, Gonal F, Cetrotide - retrieval 3/6 - , PIO, estrace 3xday - FET 4/18 = Beta 1: 616; Beta 2: 1342 = BFP 

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  • mcgeevamcgeeva member
    edited February 2014
    Sorry double posted by accident

    Married: 5/09 ~ TTC Since: 10/10 ~ PCOS ~ Progesterone from 10/10 - 2/11 ~ HSG on 3/18 - Clear ~ Started Metformin 1000mg & Clomid 50mg 2/11 ~ Metformin upped to 1500mg 4/6 ~ 6/7 Now going to SG and put on Clomid, Ovidrel, Gonal F, Prometrium, Estrace ~ IUI #1 7/2 = BFP!!!!!! March 6th our little man was born. 

    6/17/13 - Ovidrel, Follistim, Prometrium ~ IUI #1 7/2 = BFP! March 17th our St. Pattys day baby arrived

    10/29/17 - Started process for IVF, got pregnant & miscarried a 2nd time since summer. 2/22 started stims - Menopur, Gonal F, Cetrotide - retrieval 3/6 - , PIO, estrace 3xday - FET 4/18 = Beta 1: 616; Beta 2: 1342 = BFP 

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  • RrrrrachelRrrrrachel member
    They can be wildly inaccurate. I had one at 40 weeks that said not to expect a baby under 8 pounds. Baby showed up at 41+2 7 pounds 11 ounces.
    Mama to a little girl born July 2011 and a little boy born April 2014! Baby Birthday Ticker Ticker
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  • Tantan2779Tantan2779 member
    Both times they were off by a pound - baby weighed less than they predicted.
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  • thebretanafamthebretanafam member
    I was told that my daughter was measuring at 7 lbs. at the absolute most, and this was the day I went into labor. She ended up being 8 lbs. 9 oz., so I don't have very much faith in their accuracy.

    image 

    Baby Birthday Ticker Ticker

    Lilypie Pregnancy tickers

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  • pigtails1031777pigtails1031777 member
    They thought my 34 weeker would be 4lbs. She was 5.10
    1st loss 8/31
    2nd pregnancy -TWINS lost DD1 twin at 8 weeks 6 days DD1 born 6 weeks early
    3rd pregnancy- TWINS AGAIN lost both babies at 9 week appt
    4th pregnancy- singleton- born at 38 weeks 1 day with the help of weekly 17P injections
    5th pregnancy- CP in June
    6th pregnancy It's a BOY


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  • cMichelle0423cMichelle0423 member
    Ultrasounds are notoriously wrong at estimating baby's weight. They can be off up to 2 or 3 lbs either way. I was told at 40 weeks that my son would most likely not make it past 6 lbs, then 4 days later he was born weighing 7 lbs 4 oz.
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  • karichkarich member
    Not very, I don't think.

    At 36 weeks, my baby was estimated at 4lbs, 11oz. He was placed in the 4th percentile and I started being worked up for IUGR.
    Had another ultrasound a week later with MFM who stated she had "no idea" where the last measurement came from, because he was then measured at 6lbs 5oz.
    Poof! No more IUGR.

    We'll see where he's at when born.
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  • ufsandra85ufsandra85 member
    today i was 37 weeks and they said he was 7 lbs 10 oz but there is a 1 pound margin of error. My sister was told her baby was about 7.5-8 pounds and he was 10 lbs 13.5 oz

    Married 11/27/09 and TTC right away
    Dx: Complete septate uterus with cervical duplication, endometrial polyps, PCOS, endometriosis, hypo thyroid, luteal phase defect
    4 uterus surgeries to correct my complete septum and to remove polyps and 2 years of seeing the RE, medicated cycles and IUIs
    Baby 1 and 2: BFP 3/3/11 with 2 babies EDD 11/1/11, M/C 4/6/11
    Baby #3: 8/11 pregnant EDD 4/27/11 and m/c:(
    Baby #4: 10/12/11 BFP! EDD 6/16/12m/c 10/26/11
    Baby #5: 3/13/12 BFP! EDD 11/25/12 ANOTHER m/c :(

    Baby #6: 2/14/13- BFP! EDD 10/24/13, CP 2/19/13
    Baby #7: 3/15/13- BFP! EDD 11/27/13, another CP
    Baby #8.  BFP 5/19/13 EDD 1/22/14. 8 was not our lucky number

    4th septum resection on 5/31/13.
    Baby #9: 6/29/13 BFP. C section scheduled for March 5th!

    My miracle baby was born March 5 at 9:33am. He was 8 lbs 12.5 oz and 21.25 inches long!

    image"">

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  • kat8805kat8805 member
    After my last u/s with my first, they predicted she would be an 8lb baby full term. She was delivered at 38w2d weighing in at 8lbs 1oz. I'd say its about as accurate as a weather forecast.
    imageimageimage




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  • RebeccaY1RebeccaY1 member
    I've heard that ultrasounds aren't a very accurate way to measure the weight of the baby.  It can be off by several pounds. 
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  • HelenahhandbasketHelenahhandbasket member
    DD was estimated at 7 lbs and was 6 14 at birth-- so for me it was pretty close.  I also have a girlfriend that gave birth to a 9 lb, 15 oz baby boy -- and his estimated weight was 10 5.

     

    BFP 1- EDD 2/09/11 Missed MC DX @11 weeks D&C- 7/25/10 BFP 2- EDD 12/22/11 Natural MC @ 5w 2d BFP 3- EDD 1/25/12 DD Josephine born 1/16/12

    Lilypie - (TUWi)

     

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