Hi! I just wanted to pop-in since I had this happen. :) It's normal for babies to vary in size. My baby was off by 6 days then given 3 back then again moved back. LOL Even at my big scan she was showing smaller. My OBGYN doesn't move your date though unless it's a week or more difference.
And just for reference, my baby was 8lbs 12oz at birth (so not so small for those 6 days!) and just turned 10 months on Tuesday and is 22lbs and 29" long, growing perfectly. :)
If at some point your doctor feels the baby isn't growing at the right rate, s/he'll tell you!
I wanted to chime in to agree with the other ladies. In both my pg the 20 wk dating has put them up to a week ahead and behind where they should have been. In fact with my second i had a scan after 30 wks due to poor weight gain that suggested that my dd was 2 weeks ahead of where she should have been. Both my babies were 8lbs 8oz at term (second was just really long, over 22")
It may depend on what kind of ultrasound technology they are using. I remember reading that one is more accurate than the other, but I can't find the source now. I can't remember whether it was transvag or the old school full bladder ultrasound that was more accurate. I think it was transvag that could sometimes lead technicians to inaccurate measurements. I wouldn't worry too much though so long as it's not a huge difference in days. Even when my daughter was born, the nurses were getting measurements wrong and it's much easier to measure a baby who's not in utero. ;0) You have to remember user error has some contribution to it, and there's always some margin of error.
This in fact usually happens to me. I am always several days behind my EDD. Late implantation and late ovulation are two main contributers. Also, sometimes the measuring might not be as accurate, the babies are soooo very tiny to begin with. I wouldn't be concerned at all. This is my 7th pg, 6th baby and its the first one to measure right on schedule.
Hi! I just wanted to pop-in since I had this happen. :) It's normal for babies to vary in size. My baby was off by 6 days then given 3 back then again moved back. LOL Even at my big scan she was showing smaller. My OBGYN doesn't move your date though unless it's a week or more difference.
And just for reference, my baby was 8lbs 12oz at birth (so not so small for those 6 days!) and just turned 10 months on Tuesday and is 22lbs and 29" long, growing perfectly. :)
If at some point your doctor feels the baby isn't growing at the right rate, s/he'll tell you!
Good luck!!
Erin
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Three possible contributing factors: 1) could be a late implantation.
Jules - Happily married and Momma to DS, DD and expecting our Caboose Baby 11/24/2012
It may depend on what kind of ultrasound technology they are using. I remember reading that one is more accurate than the other, but I can't find the source now. I can't remember whether it was transvag or the old school full bladder ultrasound that was more accurate. I think it was transvag that could sometimes lead technicians to inaccurate measurements. I wouldn't worry too much though so long as it's not a huge difference in days. Even when my daughter was born, the nurses were getting measurements wrong and it's much easier to measure a baby who's not in utero. ;0) You have to remember user error has some contribution to it, and there's always some margin of error.
Had to edit my last post.
Thanks again.
Jules - Happily married and Momma to DS, DD and expecting our Caboose Baby 11/24/2012
just thought you might like to know that my DR mentioned to me today that on ultrasound there is a 5 day error for measurements.