97th percentile for growth? At 20 weeks

posted 1 month ago in Pregnancy
Post # 2
Member
1902 posts
Buzzing bee

mrssouthernfairytale :  I would talk to your doctor. The bigger the baby doesn’t mean you’ll go early. My daughter was 9 pounds and no one knew it (my poor vagina). I was told she was measuring ahead and they estimated her to be 7 pounds. Obviously they were wrong. I also was 1cm and 80% effaced for over a month. Everyone was convinced I was going early. I went two weeks passed my due date and had to be induced. You just never know. When are you due?

Post # 3
Member
1448 posts
Bumble bee
  • Wedding: February 2011

Honestly, scans can be up to a pound out by the time you hit 35 weeks so I wouldn’t be overly concerned at this point in time. Your baby is also still quite little at 20 weeks so even being a tiny bit out when taking measurements can mess with the percentiles.

Post # 4
Member
117 posts
Blushing bee

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mrssouthernfairytale :  I am pregnant with my second (30 weeks) and the baby is measuring at the 99 percentile. My first was also over the 95 percentile so…yay! genetics! (and also Type-1 diabetes, but in this case the whole baby was big not just the abdomen, which suggest genetics not the diabetes)

With my first, I was induced at 37+3 however this was due to risks associated with the diabetes, not the size of the baby. Her estimated weight was 4200g (so well over the 95 percentile) and the induction took 4 full days, which suggests that my body was not necessarily prepared to have the baby at that time and it is unlikely she would have arrived so early on her own. Her actual weight at birth was 3800g.

Lessons learned?
1. All measurements are estimates only. Obviously they suggest a tred (your baby is bigger than average!) but remember to take them with a grain of salt. 

2. Size does not equal arrival date. My large baby probably would have stayed put for a while longer had nature been allowed to run it’s course.

3. You don’t want the baby to arrive too early. I was actually excited that my daughter would be delivered early – it would let me meet her earlier and I would avoid an extra 3ish weeks of pregnancy – but you have to remind yourself that babies usually stay in till they are ready. In my case, I had a brutal 4-day induction, because my body wasn’t ready, and my daughter was taken directly to the NICU as her lungs needed some extra help to get going. All’s well that ends well but this time around I am not wishing for an early delivery! 

Regarding this pregnancy, I did ask my doctor if there was a chance the due date was off and was told that no, dating is done based on standard developmental stages in the first trimester not size so the dating is usually quite accurate. Growth comes after that and just is what it is. I also asked if there was a chance I would be induced even earlier, because this baby is SO big, and was told it’s unlikely and would only be done in a case of urgent medical need. Apparently size doesn’t qualify because a c-section can always be done if the baby is too big (where I am it is an estimated birth weight of over 4500g) and they would far rather wait and make sure all the organs are fully developed.

So yeah, not sure if any of this is helpful but that’s my experience. In summary – at this stage it is possible for the growth to slow (mine looks like it might be slowing which I really hope it is) however if you are measuring at 97 you are going to be looking at a larger than average baby (whether it stays at 97, or goes down to 90, it is still going to be larger than average). While the baby could come early, size alone doesn’t necessarily mean it will (naturally) and you would have to talk to your doctors about if it would make sense to induce earlier.

Post # 5
Member
189 posts
Blushing bee

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mrssouthernfairytale :  I had several ultrasounds throughout my pregnancy and the growth percentage was always changing. I can’t remember the exact weeks but has scans around 20, 28, 32 and 36. the percentage went from 99th percentile ( i was freaking out I was going to have a huge baby) to like 78th to the 65th. My little guy was born 7lbs 13oz. I wouldn’t put too much thought into the percentiles at this point. 

Post # 6
Member
9397 posts
Buzzing Beekeeper

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MsTrulove22 :  This. LO often measured small (so small that my OB ordered extra scans), but he ended up coming 2 weeks early at a perfectly reasonable 7lbs 3oz. If your OB isn’t concerned, I wouldn’t be either.

Post # 7
Member
9717 posts
Buzzing Beekeeper
  • Wedding: August 2012

Have they tested you for GD?

Those measurements can be pretty off though, I really wouldn’t worry about it. Dd’s estimate was like a full pound off.

Post # 8
Member
8750 posts
Buzzing Beekeeper

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mrssouthernfairytale :  my daughter always measured large/ahead and she ended up arriving 2.5 weeks early a nice little 6lb 10oz. She actually came more in line with when the midwife thought but my official due date wasn’t changed because I did IVF. I’m 25.5 weeks with #2 and little dude is also measuring large/ahead but since he’s also IVF the “official” due date is what it is, but they said expect another early one. 

I don’t know anyone whose measurements ended up being perfectly accurate – it’s an estimate and a range not an exact science.

Post # 11
Member
9379 posts
Buzzing Beekeeper
  • Wedding: October 2013

my 2nd baby was “on track” to be a 10lb baby and she was born 1 week late at 7lbs, 5oz.

those measurements can be way off

 

Post # 12
Member
631 posts
Busy bee
  • Wedding: August 2014

My son measured right on at 19 weeks, then about 2 weeks ahead at 28 and 32 weeks, then a week behind at 36/37/38 weeks (did weekly scans due to the drop, 75/80th% down to 25th). He was born at 39+2 at 6lb13oz. So the late measurements were pretty accurate. Unsure if the earlier ones were off or if he just had growth spurts then slowed down 🤷‍♀️

Post # 13
Member
936 posts
Busy bee
  • Wedding: August 2016

They can definitely be off! I gave birth right after having a growth scan, the scan said about 30th percentile and baby was born at 70th.

Post # 14
Member
2172 posts
Buzzing bee
  • Wedding: March 2019

When I went in for my anatomy scan, my Ultra sound tech said that they will hit growth spurts and plateaus. You probably just caught him in a growth spurt! I wouldn’t worry about it until you get closer to your due date! 

Post # 15
Member
37 posts
Newbee
  • Wedding: September 2017

I had the exact same news at my anatomy scan last week (baby measuring 97th%ile for length and weight). I am only 5’2”, 100lbs pre-pregnancy and my husband is 5’7” so we were also surprised! My OB and a friend who is an OB both said it does not mean the baby will come early or be big at term since things can very quite a bit in the 2nd trimester and that they prefer to stick with LMP dating/dating from earlier scans.

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