Babies: 0 - 3 Months

Ultrasound weight vs actual birth weight

Just wondering how LO's birth weight compared to the predicted US weight right before birth. Was it higher or lower & by how much??

I have a few more weeks, but baby's a little on the small side (according to US) & I just need some reassurance.

DS1- Jan 2011
DS2- Sept 2012
M/C- Sept 2011

2u2!

Re: Ultrasound weight vs actual birth weight

  • I didn't have an ultrasound right before birth but had one at about 34 weeks and based on that the dr. predicted my DD to be about 6.5 to 7 pounds.  She was born at 6 lbs 2 oz, so it was a little high in my case.  My little girl is teeny.
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  • Two weeks before I had DS the ultrasound said he was 9 lbs and 8oz. When he was born he weighed 9lbs and 1oz
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  • with DS#1 I was told by 40 weeks he would be 9lbs, he was born at 40w5d and weighed 8lbs 14oz. with DS#2 I was told he would weigh around 8lbs8oz by 38weeks, he was born 38w1d and weighed 8lbs2oz
  • I only had a weight prediction at 31 weeks, but the doctor claimed DS would be in the 40-50% (whatever weight that might be). He turned out to be in the 90th! (He was nearly 9 pounds).

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  • I had a US about a week before Sophie was born and she said she was about 6 and a half lbs. She was born 5 lbs, 15 oz.
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  • The US the day before I delivered said 5 lbs 3 oz, and LO was 5 lbs 11oz
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  • My 40w2d scan predicted 9lbs, 5oz; at 36w2d they estimated 6lbs, 2oz.  She was born 41w1d at 8lbs, 4oz.
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  • Ultrasound at 38 said she'd be between 7-8 lbs, she was 6,11 so pretty close.
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  • My 36 wk Ultrasound shows DD @ 7 lb 9 oz.  She was born at 37 weeks and weighed 6 lb 13 oz.  My dr said ultrasounds can be off by 1 pound either way.  In my case, she was obviously lighter than predicted.  But I have seen a lot of people where their LO weighed more than predicted.
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  • I got a growth u/s done the day before my scheduled induction at 41 1/2 weeks and they estimated that my LO was 8lbs. 1oz. and she was 7lbs. 7oz. when born the next day.

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  • At my 35 week u/s the tech predicted my DD would be 6 lbs 8 oz and he was exactly right! Amazing guess;) She's a tiny peanut!! 
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  • They estimated DS at 8lbs 10oz one week before I had him at 8lbs even.


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  • Four days before G was born, the u/s predicted he would be 6 lbs, 8oz. He was 7 lbs, 9oz.
  • I had a growth u/s every 4 weeks due to IUGR.  They estimated DD's weight to be 6lbs 8oz at 39 weeks.  She was born 6lbs 5oz at what they thought was 39 weeks, however, they determined after I had her that my u/s were off and she was actually 38 weeks gestational age.

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  • 31 week 3 days 3lbs 5oz

    33week 3 days 3lb 13oz

    35 weeks 3 days 4lbs 7oz

    Born at 36 weeks 3 days 4lbs 10oz.
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  • At 37 weeks, they predicted 7 lbs even. He was born at 39 weeks and he weighed 8 lbs, 1 oz.
  • I had 2 u/s the week before DS was born due to GD.  At 38.5 weeks they estimated him already at 9lbs 6oz.  At 39.5 weeks they estimated him at 10lbs.  He was 8lbs 1oz when he was born (c-section) two days later.  So, obviously WAY off in my case.

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  • Thanks everyone :) Lots of varied weights, so thats good.... I feel like he's bigger, but its probably just because its 25lbs total lol. Hopefully they're just underestimating!
    DS1- Jan 2011
    DS2- Sept 2012
    M/C- Sept 2011

    2u2!
  • at 36 weeks 5 days they told me she was 8 lbs 8 oz. i had a scheduled c-section (because of that) at 38 weeks 3 days and she was 9 lbs 3 oz. so they were accurate.
  • haha... Funny you ask.... At 38 weeks they estimated her weight to be 7 lbs 9 oz... She had to be delivered by c section at 40 weeks because despite induction I couldn't get past 1-2 cm... She weighed 9 lbs 4 oz... WAY off!!!
  • I had one right before.  The ultrasound tech said around 6 lbs and she was 6 exactly.
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  • imageOliver715:
    haha... Funny you ask.... At 38 weeks they estimated her weight to be 7 lbs 9 oz... She had to be delivered by c section at 40 weeks because despite induction I couldn't get past 1-2 cm... She weighed 9 lbs 4 oz... WAY off!!!

    This is what I'm hoping for! I don't want him to not fit, but I want a good-sized baby, you know? Off by 2lbs is a lot!! My gut feeling is that he's bigger so I guess I'll just wait & see.....

    DS1- Jan 2011
    DS2- Sept 2012
    M/C- Sept 2011

    2u2!
  • I was told 7.5 lbs at 35w6d ultrasound.  I delivered 5 days later and he weighed 6lbs 11oz.  So it was off a bit.
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  • They predicted M to be 8 pounds 11 ounces, and she was 8 pounds 5 ounces.  There are so many things that can make their measurements be off- don't be too concerned!
  • I had a growth ultrasound 4 days before I delivered and they told me 8 lbs 0 ounces.  When Landon was born he weighed 9 lbs 5 ounces, so they were off quite a bit.
  • Seven days before my scheduled C/S the US tech said 9 lbs, 7 oz. She was 9lbs 5.7oz when she was born.
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  • I didn't have an ultrasound for weight done, but my midwife felt my belly and said 'whoa thats going to be a big baby!' At 36 weeks she was predicting she was over 7lbs and if I went to 40 she would be 8/9 lbs. Baby was born on 12/13 at a shocking tiny 6lbs 5oz! I had braced myself to push out a big baby but when they put her on me I could not beleive how tiny she is.

  • I had a growth U/S at 35 weeks and LO was 6lb 7oz at that point- which would predict him to be about 9 1/2 lb at birth. I had a c/s a week before my due date and he was 8lb 15oz- so it was right on!!

    With DS1 he measured 6lb 7oz at 34 weeks, and I also had another u/s 3 days before he was born- it said he was 9lb 4oz, and he was 9lb 11oz at birth. 

    So for my guys they were pretty damn accurate! I think the tech doing it has a lot to do with it, and they also told me if baby has a large abdomen it will throw the weight estimates off big time. 

    HTH!

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  • U/S on due date said 6 lb 10 oz. She was born the next day at 7 lbs 1 oz.
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  • I think I've got the biggest baby in this thread!

    I had two growth U/S during the 38th week, both predicting him to be 9lbs 2 oz. 

    We was born at exactly 39 weeks weighing 9lbs 13 oz. I count my blessings for the existence of this technology - I certainly don't regret getting a c-section as the doctors suggested. There was no way that this moose was going to exit my petite body any other way.

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  • At 32 wks I was told 4lb, 6oz. LO was born at 36 weeks at 5lb, 4 oz. So, I dunno..
  • At 36 weeks on u/s they said he was 7lb. They predicted he would be 9.5+ lbs. He was born on his due date at 7lb 15oz.
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  • U/S at 39 weeks estimated DD at 8 lbs. 12 oz.  I delivered at 40 weeks, 4 days.  This estimate would have her at close to 10 lbs by then. She was born 7 lbs. 8 oz. 

    I will say that according to the tape measure that the dr. did weekly, I was only measuring about 37 weeks when I was 39 weeks, so the two were definitely far apart.  My OB really didn't agree with the u/s estimate because I didn't measure that large the whole time.  The only reason I got that u/s in the first place was because we were flagged for a study a doc in the office was doing. 

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  • I think the last ultrasound said 6 lbs 5 oz or something like that, she weighted 6 lbs 13 oz, so not far off.
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