How accurate were growth scan percentiles compared with your baby’s birth weight?

[Shopaholic100]

What percentile did you measure during pregnancy and how much did your baby weigh at birth? Just intrigued to see how accurate the measurements are.

I was told 9lbs and came out 7lbs.

Not hugely accurate, my eldest they said likely to be around 8lb, he was 6lb 10 oz at 41 weeks. Youngest they estimated would be around 8 lb 7 oz, he was 7 lb 7 oz at 39+3

I can’t remember all of the exact figures now but both of mine were predicted to be around 25th centile. I had fairly regular scans throughout both pregnancies. Dd came out about 15th centile and Ds was 3rd or 4th centile so he was SGA. Both babies were predicted to be about mid 7lbs. They were born higher end of 5lbs range.

Quite spot on with both my babies. DS1 had FGR and was born on the 2nd centile, 5lb 13oz and was estimated 5lb 14oz at 40 weeks (born 39+3). DS2 estimated 7lb 9oz and was 7lb 7oz again at 39+3. I had a lot of growth scans with both babies.

Only had it with one of mine, but they were 3lbs out!

pretty accurate for me😊 estimated just under 50th centile, came out 39th.

I was told baby was 99th centile on the scan. Read a load of stuff on here about growth scans often being inaccurate and decided to attempt a vaginal delivery.

scan was bang on the money - 10lb 12oz. Unfortunately ended in an EMCS but I recovered well.

Dd was predicted to be a 9 pounder. She was born two weeks late at 8lb 3 so still big but not enormous! I think the prediction was partly based on the fact that I had been a big baby.

1st two babies were spot on. 3rd baby was well off - they did a section at 38 weeks with my "whopper" baby who turned out to be 7lb 7oz. However she was living off a huge placenta, it caused a lot of interest in theatre among the midwives. It bled like crazy when it detached and I had a large PPH, luckily they were able to stop the bleeding. They said afterwards that I'd been very lucky that I'd had that scan else I could have been in serious trouble in a normal delivery room.

Very accurate for babies 2 and 3. Baby one they had me on fortnightly scans for weeks 26-36 because apparently he was going to get very small. 8lb 2.

DS was two weeks late. I don’t remember the centiles but I do remember being told “Baby is no more than 7lbs”. DS was born 3 days later weighing 8 pound 11.

Only had the 20 week scans and both were spot on for percentile at birth

Very but my son was supposed to now be an adult well over 6 feet, and hes 28 and about 5 11.

Can’t remember the birth dentil with DC2 but I kept having growth scans and they said I’d be lucky if she was 5lb. She was 8lb 3oz.

@Shopaholic100 I was told I was having a very small baby with very short legs. From memory I think he was estimated to be around the five pound mark. I only gained 15pounds and I went to just shy of 10 months! He was 8 pounds 4 ounces! His head was huge! I‘m glad I went into labour not knowing that though. Psychologically it helped me thinking he was only small..his head was very very difficult for me to deliver.

For DC2 we ended up (purely by chance because of being closer to a different hospital second time around) having access to a really state of the art scanning institute. Even so we were quite surprised when DC2 was measuring large and very heavy from the first scan! Everyone around me anecdotally told me that they’d unlikely be that big but to be honest I’m not sure why I ever doubted it - DH and I are both tall, DH was a large baby and my bump was massive (I got the classic “are you having twins?” a few times 🙄). Also no gestational diabetes or anything that would point to another reason for a large baby. I was grateful that I was also referred for extra scans to check growth which further confirmed DC’s larger stature!

DC2 was born via c-section and was pretty much 10lb at 39+4 which was very accurate with what the scans predicated. I do know friends whose scans predicated heavier babies that what arrived, but I know with DC2 that I felt so much bigger from day 1 than I had with DC1 and in some ways had no reason not to trust what I was being told. I would always recommend requesting another scan / second opinion if you have any concerns about predicated birth weight.

My son was always around 25-30 percentile for scans. At birth I believe he was 18th percentile, so not far off at all.

My little one was estimated at 8lb 10 oz and was born 4 days later and weighed 9lb 11oz so I would say it was not very accurate

My baby came seven weeks early, but I’d had a growth scan only the week before he came where they told me he’d gone from 22nd centile to 45th centile. He was born at 65th centile at 33+1 weighing 1.9kg/4lb 3oz. Thankfully they were quite wrong!

My first was apparently enormous and my second tiny, had to have growth scans for both one for being too big and one too small, the ‘big’ one was 8lb exactly and the small one was 7,15oz so very inaccurate for both

My last growth scan was at 34 weeks and based on this baby would have been about 6lb at 37 weeks and he was 6lb12 oz 37+1 ⁰although very scrawny compared to my daughter who was 6lb13 at 38+6. Her bump was 10th percentile based on fundal measurement so was prepared for her to be smaller than she was. Both are on lower percentiles for length/height than they are weights though. I make small and dense children! My 5.5 year old is still in 3-4y clothes and my 7 month old many of his 0-3 month clothes!

All 3 of my children have been 25th percentile at birth according to their gestational age (I had one at 35 weeks, one at 39 weeks and one at 42 weeks, so their birth weights differ but their proportional percentiles were the same). They tracked on the 0.2nd, 10th and 90th percentile respectively.