Ok so I went to an u/s appt today and left feeling very confused. First off the baby is very healthy which first and foremost is what is important so I am happy about that but anyhow here is the reason for my confusion...My doctor had told me that my due date 11/25 which puts me in week 20 right now. During the u/s I asked the doctor that was conducting it if he could tell me how big the baby was at this point, he proceeded to tell me that the baby was small, not small enough to be concerned but small meaning she is in the 25th percentile. He never gave me a length or a weight which is what I was wanting to hear because in my mind that is what makes sense. He also asked how big ds was when he was born and how far along I was when I had him, I guess to make a comparison between the two. Then he asked what my due date was and when I told him 11/25 he said hummmm....so I asked why and he said well the first due date is the best to go off of but I am showing a possible window of 11/12 to 11/21. So now I am wondering what he is basing "small" off of. Also since the very beginning I wasn't sure when my last af was because I went off the pill had an af and two weeks later had another one then two weeks later was pregnant so I was never certain if that second af was really an af or not (I hope that makes some sense). So am I 20 weeks or 22 weeks and again what is small based on? Anyhow I am very confused and I can't wait to go to my follow up with my ob tomorrow because I have a ton of questions. Any input until then would be very much appreciated.
Hmmm... I'm confused too. I'm not sure how they measure or which measurements you are talking about.
Could you see the measurements being taken on the screen? At my U/S,they measured his bones, abdomen, head, etc. and everything was in the 20 week range like it was suppose to be. I don't know if you were able to see if everything was measuring 20 weeks or not. I'm not sure if you were talking about that kind of measurement. Sorry.
The U/S tech at my appt. couldn't tell us how big he was either and couldn't really compare his size to anything b/c she didn't know but she was able to weigh him and he was 13oz.
i cant help with how far along you are but i have been told that ultrasounds arent very good at telling how big the baby is it can just give an estimate. like i have said on here an ultrasound estimated my friends baby to be at least 10 pounds and she was only 5lb 13oz so your baby may actually be bigger then they said. also i read somewhere it isnt considered unhealthy unless the baby falls below the 5th percentile or above the 95th percentile. look up average fetal growth and it will explain when to be concerend. but 25th isnt bad and i wouldnt be overly worried about it especially not before you talk to your dr. you dont wanna get all stressed for nothing
I just had an u/s this week because my baby girl has a single umbilical artery. They have been doing monthly u/s to monitor her growth because apparently it can cause low birth weight. Any how, like the previous poster said, when they are measuring each part of her body (leg bones, head, abdomen etc.) it shows on the bottom or the screen the measurment and then it calculates that measurment to a week. While everything didn't measure exactly to 27 weeks 6 days, which is what I was at that point, it measured to about that time frame, give or take a few days. I THINK they use the final measurements to calculate the weight of the baby because when she was done taking all of the measurements, she waited a few moments for the final calculation to take place and then told me that my little girl weighed 2 pounds 5 ounces, which she said was appropriate for the gestational age. Although I have always heard these are just estimates and can be off by as much as a pound or more either way. I can relate to where you are coming from though because when I was pregnant with my first daughter they said that she was a little on the small side when I was around 34 weeks after having an u/s. I believe they said she was in the 42nd percentile for her weight at that point, but I guess that was still considered a little below average. She was born at 6 pounds 11 ounces and as healthy as could be, besides the fact that she had two holes in her heart, which they knew about from my first u/s at 20 weeks. While 6 pounds 11 ounces isn't huge, it's not that small either. They usually base the NORMAL weight on 7 pounds 5 ounces but a lot of babies are smaller than that or bigger than that at birth. It's just an average. I think sometimes the whole weight size factor during u/s can be confusing and scary to us mothers because it means everything to us and makes us worry if something is off, but I can say that even though my daughter was considered small, she was perfectly healthy and 12 months later still is. I hope this wasn't confusing and helps a little!
~Ella Ann, July 2, 2007~
~Madilyn Mya, September 21, 2008~
This reminds me of a friend of mine, a few years ago, she thought her conception / AF date was different than what the dr's put her due date at. When she got near the end of her pg, they were doing U/S's and said they wanted to do c-section because the baby is getting too big and thought she was overdue.
Well, it turned out the little thing only weighed 5 lbs something when they took her out, and my friend really thinks they were a month off on her due date. thankfully the baby was perfectly healthy and beautiful, but definitely a good thing to keep in mind.
Thank you ladies for your responses so far. I think the two week range of Nov. 12th-21st was based on the measurements he was taking of the head, stomach, legs, etc. and maybe the 25th percentile was based upon a baby that was at the gestational age of 20-22 weeks...gosh I don't know. Like I said he wasn't concerned at all and I was OK until I left and realized I had a ton of questions about what he told me so I guess I'll find out more tomorrow. The baby was moving a lot and as I mentioned all of her organs where perfect so I'm happy but confused.
Tiffany I am so sorry that you are confussedI would be too. I unfortunatly cannot help witht he due dat but I am hoping taht your OB will answer all your questions. Good luck for your appointment today cannot wait to hear all aboout it.
All u/s measurements are +/- 2 weeks.........so don t worry too much. The important thing is that from 1 u/s to the next the baby grows. What you can do is ask for monthly u/s to ensure this.
U/s measurements are not 100% accurate and are also operator dependent.
With DS i used to have 2 u/s in 1 day. A normal u/s done by my obs and a doppler done by a specialist the measurements were never the same.
The most accurate ultrasound measurement for dating purposes is the first one around 6-8 weeks. Since babies all grow at different rates, due dates are not changed based on subsequent measurements since that usually indicates that the baby is growing faster/slower than "normal" (50 percentile). It's important for them to follow baby's growth to determine if there is a problem --- if baby is consistently in the 25 percentile on future scans, then it might just be that your baby will be small but fine. Or, there could be a problem that would require intervention.
Our Friday appt left dh and myself feeling much better. My ob was able to answer my laundry list of questions and now I feel like things make sense. Basically the way she explained it is that there are different growth charts for every age including fetal age so based off of that chart when comparing little girls measurements with other 20 week old fetuses she is in the 25th percentile therefore she is on the smaller side of average which is 50%. She also said these growth charts are an average of 20,000 individuals. Apparently they don't get concerned until the 10th percentile or lower. The doctor said some women have 10lb babies (OUCH) and others have 6lb babies and this one is likely to be 6lbs or so. Also I was confused about the due date that showed up on the u/s screen because it gave a two week range and if you remember I had funky af's when trying to conceive and wasn't sure which one to use so that worried me but she said that the farther along the pregnancy is the harder it is to determine an due date because of the different growth rates so the possible range is bigger therefore it is best to use the original due date that is taken between weeks 5-12 then the margin of error is usually within about 3 days instead of two weeks. She assured us that things are going great and I'm right where she wants me to be. Anyhow needless to say we feel much better and hopefully that all makes sense to you ladies...sorry for rambling but thanks for listening and for your support!
Hi Tiffany, I am happy to hear that your specialist managed to answer all you questions and that you and DH are feeling better now. I am sure your little one is going to be just fine and will have a healthy birth weight. You still have 20 weeks to go.