How accurate have your growth scans been?

(23 Posts)
Cocoben Thu 07-Jan-21 16:52:52

Hi, I had a private growth scan today at 32 weeks +3 and the baby is measuring at a hefty 4lb15 already and I'm now pretty terrified of how much she might continue to grow over the next 8 weeks +.

The head was on 88%, tummy on 66% and legs on 77%

Just wondering how accurate other people have found these to be compared to birth weights?

OP’s posts: |
QuantumJump Thu 07-Jan-21 16:55:27

My friend had a growth scan at 38 weeks and was told she was having a massive 11-12lb baby which scared her a lot! In the end the baby was 9lb, so a big baby but nothing like the massive one she was expecting. I think they can be quite inaccurate.

FudgeSundae Thu 07-Jan-21 17:05:46

They’re not accurate at all. My first baby “measured” 2.4kg at 37 weeks exactly (30th centile), she was born at 38 +4 weighing 2.35kg (below 1st centile)!

Glendaruel Thu 07-Jan-21 17:06:12

My scans had her on the curve to be 7lb 3oz. A week before she was born they said they expected about 6lbs 9oz. She was born by emergency c section at 5lbs 11oz.

WildCherryBlossom Thu 07-Jan-21 17:08:54

Not accurate! All of mine were way out.

DustyMaiden Thu 07-Jan-21 17:11:34

My tiny baby that was not growing weight 8 lbs.

Eileithyiaa Thu 07-Jan-21 17:12:13

They measured mine at 6lb three days before she was born weighing 7.7lb!


Teakind Thu 07-Jan-21 17:15:15

I had numerous ones with my DS and he was as predicted.

JumperooSue Thu 07-Jan-21 17:32:41

I had four, all roughly around 80th centile. Had one at 40+3, stayed with the previous trend of a bigger baby. She was born 7 days later 10th centile, 2lb smaller than the scan had predicted🤷🏼‍♀️

Keyboard91 Thu 07-Jan-21 18:39:00

LB popped out as expected and had measured on the same line throughout (NHS growth scans).

Beach11 Thu 07-Jan-21 18:40:36

100% told dc would be 8lb at term & was 8lb.

EllyNC Thu 07-Jan-21 18:43:20

My prediction was 1lb out, so Inaccurate in my case!

amberob89 Thu 07-Jan-21 18:45:39

I had a scan and my lb was estimated 6lb 4 at that time, I had him the day after and he was 6lb 3

jbx10 Thu 07-Jan-21 18:53:43

I was also wondering this! I've just had a growth scan at 33+ 2 and my baby is measuring 4lbs which they are telling me is very small & starting to suggest an early induction. But I'm not fully comfortable agreeing to an induction if In fact their measurements are not accurate!

I have had 3 growth scans (every 2 weeks) she is following her own curve just small. Did anyone find when they had more than one growth scan the readings were more accurate ?

ClockSpanner Thu 07-Jan-21 19:42:26

My last baby they said would be 9lbs 1oz was 8lbs 13oz so a bit over on the estimate. This time I've had a scan at 32w exactly and estimated weight was 4lbs 4oz so apparently on track for another high 8lbs to low 9lbs baby which is what I would expect now anyway.

alphabetti Thu 07-Jan-21 20:01:25

I had 6 growth scans due to diabetes and baby being on smaller side. Last growth scan at 38wks showed her to have grown towards average and measured 6lb11oz. Baby girl born 39+1 weighing 7lb3oz so I think my growth scans were accurate.

Skylucy Thu 07-Jan-21 20:08:24

I was given extra scans because my bump was small. I was then told baby was over 9lbs at 36 weeks. I was terrified. He arrived naturally 15 days late.... and was 8lbs7oz! I've actually don't know anyone who's had an accurate growth scan!

Autumn13 Thu 07-Jan-21 22:34:49

I really wish they'd forget these growth scans. I had 3 which indicted my baby was huge, by 38 weeks they said she'd be over 10lbs and they induced me and said I'd likely need a csection. She was born 8.3lbs vaginally... Literally no need to induce me.

Maidmummy Fri 08-Jan-21 06:50:22

They estimated my DS to be 6lb 14oz at 38 weeks he was born at 39+5 weighing 6lb 11oz when by that stage he should have been nearly 7lb 12oz by their estimates so they were out by a pound, I've had growth scans in all 4 of my pregnancies and every time the baby has been smaller by a pound at birth but I was told by my consultant that the sacns aren't accurate and can be out either way by up to a pound so take the weight with a pinch of salt x

Dyra Fri 08-Jan-21 09:05:23

I had a scan at 35+6 which said baby was 6lb 15oz. Said baby was born at 37+1 weighing 7lb 5oz. So the growth scan was pretty much bang on for me.

JemimaTiggywinkle Fri 08-Jan-21 10:40:40

Evidence based birth is a great website that reviews the research on lots of aspects of pregnancy and birth.

The article below has a section evidencing that scans are not very accurate at all for predicting actual weight:

Mimiwish Fri 08-Jan-21 10:46:24

I am in exactly the same boat, @Cocoben. My baby was just above average and in my last couple of scans swung into the realm of "macrasomic" - I've even been asked to take part in a 'big baby' study. She's above 97th pc for AC, and +95 pc for size: we're now expecting a little hulk baby. They've scared me with big baby birth stories so I'm now booked in for a somewhat reluctant c-section in a couple of weeks, unless she decides to come earlier.

My bump doesn't look so huge to me; my partner and I are hopeful she won't be the whopper they're predicting since scans can be off. I just want her to be healthy: it's a shock when you hear baby is so big. I keep being asked if I've been tested for gestational diabetes but I have and it was negative. I will definitely be reporting back on her size once we know.

Sceptre86 Fri 08-Jan-21 10:56:26

With my dd they said she was measuring small and would be about 6lb, she was 5lb 10oz at 37 weeks so not far off. They said ds would be a good size, he was 8lb 10oz at 40 weeks. So for me fairly accurate.

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