Those with kids – Growth scans vs birth weight (Poll)

posted 2 weeks ago in Babies
  • poll: Did your late 3rd trimester growth scan over- or under-estimate baby's birth weight?
    Significantly over-estimated : (5 votes)
    10 %
    Somewhat over-estimated : (10 votes)
    20 %
    Fairly accurate : (20 votes)
    39 %
    Somewhat under-estimated : (11 votes)
    22 %
    Significantly under-estimated : (5 votes)
    10 %
  • Post # 16
    Member
    227 posts
    Helper bee
    • Wedding: June 2017 - City, State

    My baby was estimated to be over 9lbs and was talk of having a c-section because my narrow pelvis… nope! Baby was a peanut at 6lbs15oz hahah I did have an anterior placenta so I don’t know if that got in the way?

    Post # 17
    Member
    325 posts
    Helper bee

    For my first, I didnt have a growth scan, but a couple days before I delivered my doctor estimated via external feel that she would be about 7.5 lbs. She ended up being 7 lb 14. 

    I’m now 29+ weeks pregnant w twin boys who are so far measuring in the 74th and 82nd percentiles (God help me) and since I am having a ton of growth ultrasounds I’ll update when they are born! 

    Post # 18
    Member
    2680 posts
    Sugar bee
    • Wedding: September 2012 - Southern California

    My doctor estimated that he would be about 8lbs or so. He was born 9lbs., 4oz. 😬

    Post # 19
    Member
    378 posts
    Helper bee

    Mine said 4.5lbs…They ended up inducing me because of it (suspected IUGR–>wrong). She came out 6.5lbs a few days later at 39 weeks. She probably would’ve been 7-8lbs if they let her come on her own time. 

    Post # 20
    Member
    535 posts
    Busy bee
    • Wedding: August 2019

    These are all fascinating! I don’t know a ton of people who have had kids yet, but the handful who have were all within a few ounces of the projection, so I suspect technology is getting better. I was a hair under 8 pounds (3 weeks early) and Darling Husband was just under 10 pounds (1 week early), so I definitely plan to ask for a scan when the time comes…

    Post # 21
    Member
    424 posts
    Helper bee

    Had a scan at almost 36 weeks to check position and was told 30-50% on all measurements with a weight of a little over 7lbs. He was born at 40+3 at 9 lbs 2 oz. Had I known he was that big I would have elected the C-section when we transferred from the birth center to the hospital after 42 hours of labor. I’ll be really skeptical about late-term measurements with #2 after that experience! 

    Post # 22
    Member
    1725 posts
    Bumble bee
    • Wedding: October 2017

    Mine was spot on. They estimated 3.6 kgs at 40 weeks and he was born 1 week over at 3.73. 

    Post # 23
    Member
    1216 posts
    Bumble bee
    • Wedding: October 2017

    Mine was significantly underestimated- the dr never actually told me the estimated weight of my growth scan (which was either 36 or 37 weeks if I remember correctly) but she said the baby was just below 50th percentile. I ended up being induced for pre-eclampsia at 39 weeks and she was 5 lbs 4 oz, less than 1st percentile. Granted, she was a pretty normal length (19.5 inches), just super skinny bc of the hypertension. There’s only so much the scan can do when they’re just looking at bone length, there’s no way to tell how much fat is on those bones!!

    Post # 24
    Member
    3399 posts
    Sugar bee

    I’ve taken the deposition of an OBGYN who has delivered tens of thousands of babies and he says that the late scans are just a guess re: size.

    My son was estimated to be over 9 pounds but was 8 pounds 1 ounce.

    Post # 25
    Member
    1115 posts
    Bumble bee
    • Wedding: June 2017 - A vineyard

    My OB’s office couldn’t make up their minds. First because I had diet controlled GD they threatened me with her being too large. Then I measured much too small at my regular appointment so we had a growth scan. Then later they threatened me with her being too big again and telling me I was going to need an induction at 39 weeks. I waited it out until 41 weeks and then had the induction. She was 7 pounds in the end. The whole thing was very frustrating honestly. 

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