(Closed) Ultrasound Weight Estimates

posted 5 years ago in Pregnancy
Post # 2
Member
9800 posts
Buzzing Beekeeper
  • Wedding: September 2013

They estimated mine was 7lb12oz I think.  She was 7lbs4oz. So 1/2 lb off

Post # 3
Member
1463 posts
Bumble bee
  • Wedding: February 2011

My growth scans were reasonably accurate but the closer to due date, the less accurate they can become. I believe the margin of error can be up to two pounds so I would be reluctant to induce or make any major medical decisions based solely off of a growth scan.

Post # 4
Member
7133 posts
Busy Beekeeper
  • Wedding: September 2016

I know of someone who was told to expect her second to be around the size of her first (so around 8 pounds). She had a 10 pound baby.

Post # 5
Member
26 posts
Newbee

My SIL just had a baby last week and in the month leading up to the birth the Dr. told her that she wouldn’t tell her how much the baby would weigh because she didn’t want to scare her but that my SIL shouldn’t be expecting to give birth to a nice little 6 or 7lb baby. Well the baby ended up being 8lb hardly the “huge” baby she had been warned about. They are not always accurate.

Post # 6
Member
1082 posts
Bumble bee
  • Wedding: October 2014

My sister was told the baby would be nearly 8 pounds. He came out 10 Pounds. Big difference when you’re talking natural birth!

Post # 7
Member
106 posts
Blushing bee
  • Wedding: October 2015

They said she would be 4lb 14oz and she was 4 lbs 7oz. 

Post # 9
Member
893 posts
Busy bee

I’ve never even heard of a growth scan (I’m pretty sure we don’t get them here?). I’d love to know what weight baby is measuring at though! I’m not sure you can always predict baby size based on genetics. My brother is 6’4″ and I’m 5’4″. I was 5lbs 11 oz at birth and he was nearly 9lbs. Same mother and father and we are only 2 years apart in age.

Post # 10
Member
2208 posts
Buzzing bee
  • Wedding: August 2012

It can be pretty accurate or totally off. They told my SIL her son was going to be HUGE. That was the word they used. And estimated around 9 lbs. He arrived at 7lbs 13oz.

Post # 12
Member
1751 posts
Buzzing bee
  • Wedding: May 2014

View original reply
mrsdfarrar6714:  I had my last ultrasound to check fluid levels and baby’s weight at 38 weeks. They estimated his weight was 7lbs12oz. He was born one week later weighing exactly 7lbs12oz. So it was pretty accurate for me! 

Post # 13
Member
575 posts
Busy bee

The day I went into labor I had an ultrasound to check my placenta. They estimated a 7 pound baby, he was born 8 hours later at 7 lbs. 1 oz.  However, I also had a friend who scheduled a c-section for 39 weeks because of a 10+ lbs baby…yeah, baby was born less than 8 lbs. Her baby also needed time in NICU because he wasn’t ready to be born early, but that’s a whole other story. 

Post # 14
Member
1257 posts
Bumble bee
  • Wedding: October 2014

I have heard there is a 20% margin for error which can mean a lot!

Post # 15
Member
1937 posts
Buzzing bee
  • Wedding: October 2013

If a baby is considered big once he is above the 50th percentile, then are they too small if he’s below the 50th percentile? That seems silly to me. 61st percent doesn’t seem to be too huge, and even then size (unless very,VERY large) doesn’t really play much of a role in how your birth will go. Labor hurts no matter what, and some women are able to birth a 9lb baby and others need assistance with their 6lb baby! It’s not like it suddenly becomes impossible if they’re over a certain weight

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