thread: Baby weight accuracy?

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  1. #1
    Registered User

    Feb 2004
    Melbourne
    11,171

    Don't count on it being accurate - Juliette was predicted to be 3.2kg at term & she was actually 4.5kg so they can be waaaay out (both ways).

  2. #2
    Registered User

    Jul 2007
    98

    No they aren't all that accurate....

  3. #3
    Registered User

    Nov 2006
    south brisbane
    234

    i doubt it they told my sil that she would have an 8 pounder but he was 6 pounds way off...

  4. #4
    Registered User

    Nov 2004
    Melbourne VIC
    1,733

    At 36wks, I was told he would be 7lb8 and he was 7lb 9, so in my case they were spot on which was a surprise!

  5. #5
    Registered User

    Dec 2004
    Sydney
    1,444

    With DD#1 my obs felt my tummy and gave me an estimate and said that she would make it just under 4kg. She was born 3915g. So he was correct. Although he went by feel, not scan.

    Regarding your scan, at 29weeks DD#1 was estimated to weigh 1.7kg so you may or you may not have a larger bub.

  6. #6
    Registered User

    Oct 2008
    312

    Jordie, I had a growth estimate scan at 28 weeks too - they said bubs was around 1.5kg, my DS was born at 36wks and weighted 1.6kg so I am happy that this one isnt going to be small.

    My OB wants me to have another scan at 34 wks to see if I am having a big bubs. I am going to try for a VBAC so OB a bit worried about big bub with scar etc. My family history is for babies at least 8.5 lb - my sisters biggest was 12lb 8oz!

    I am not keen on another scan as I dont think they are very accurate and I am confidant about birthing a big baby. I have heard that being 10% off either way is about normal for the scans.

    Is your OB wanting another scan or are you just wondering about eventual sizes?

  7. #7
    Registered User

    Dec 2005
    In Bankworld with Barbara
    14,222

    Don't think any more about it until the baby is on the scales. Seriously, growth scans mean very very little.

  8. #8
    Registered User

    Jun 2008
    Tassie
    2,567

    yeah not accurate at all.

    Both the older boys were way off what they said, MORE than 700g off.

    Ashton they said he was a nice size, but they were floored when I birthed him and he was 5kg (11lbs)

  9. #9
    Registered User

    Mar 2007
    outer South East Melbourne
    2,881

    At 34 weeks I was told I'd be having a 7 to 7 1/2 pound bub at full term. I gave birth at 38/4 & he was 7 pound 13 so would've been even bigger had I got to 40 weeks. I expected a smaller bub to be honest as both my ex and I were small bubs.

  10. #10
    Registered User

    Oct 2006
    Sydney
    141

    My obst says that weight estimate scans can be inaccurate, more so earlier on, and that the best way to gauge it (if you've had a baby before) is to compare the size of your belly with the last time... although it's a little hard to remember specific weeks is it not?
    But it makes sense... if your belly's bigger this time then chances are it's a bigger baby.