How Accurate? - Mothering Forums

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#1 of 16 Old 02-12-2009, 01:52 AM - Thread Starter
 
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I'm currently at 36+3, and had an OB appt. today. We were curious and asked if the Dr. could give an estimate of how big he thought she might be from the palpitating and fundal height, etc., and he said 6.5 - 7 lbs

We had an 8 wk ultrasound, so we're pretty sure our due date of 3/8 is fairly accurate...so considering how much longer we have to go, we could end up with a pretty large baby if this Dr. is correct! DH and I were both around 6.5 - 7 at birth, so we weren't really expecting to deviate too much from that.

So how accurate are OBs usually at predicting weight through feel?
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#2 of 16 Old 02-12-2009, 02:22 AM
 
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Not very accurate. Moms are more accurate.

Even if he is accurate, the range is likely 8.5-9lbs by the 8th. That's not a big baby, just healthy.

mom to all boys B: 08/01ribboncesarean.gif,  C: 07/05 uc.jpg, N: 03/09 uc.jpg, M: 01/12 uc.jpg and far too many lost onesintactlact.gifsaynovax.gif

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#3 of 16 Old 02-12-2009, 02:58 AM - Thread Starter
 
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Thanks I was really skeptical of the Dr's accuracy! I think he may have even admitted that they're not always very accurate with that sort of thing, but I was too shell shocked to remember.

And you're talking to a first timer who was already a little freaked at the idea of pushing out a 6.5 lb. baby with no drugs, so an 8.5 lb. one sounds ENORMOUS to me, lol!
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#4 of 16 Old 02-12-2009, 03:06 AM
 
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I don't think they are very reliable either. With my first, my docs guesstimated at 7 1/2 lbs and he was 9lb 10oz. I am thinking with my history of big babies that right now at 34 weeks babe is probably right around 6 1/2 lbs.

And maybe to make you feel better, my biggest baby at 10lb 1oz was my easiest and most painless labor by far.

~Lanie mom to Layne, Liam, Maren, Meridian, and Melora
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#5 of 16 Old 02-12-2009, 04:03 AM
 
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Originally Posted by lanielayne View Post

And maybe to make you feel better, my biggest baby at 10lb 1oz was my easiest and most painless labor by far.
seriously?! that definitely makes ME feel better!

I am expecting a big baby- around 8 or 9 pounds. I was 9 pounds, my brother was 10, however all my husbands siblings were only 6 or 7 pounds so who knows! I am the most worried about pushing him out naturally though!
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#6 of 16 Old 02-12-2009, 06:38 AM
 
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Big babies are often easier than smaller ones, despite the fear mongering. They have less space to get into wonky positions & fat squishes when they come out. Head size & shoulder width are way more important than weight, imo. My babies may be on the small size weight wise, but they have *huge* heads.

mom to all boys B: 08/01ribboncesarean.gif,  C: 07/05 uc.jpg, N: 03/09 uc.jpg, M: 01/12 uc.jpg and far too many lost onesintactlact.gifsaynovax.gif

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#7 of 16 Old 02-12-2009, 11:17 AM
 
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My first baby was 9lbs and not bad at all. This is the first time you will be doing this so you have no idea what a 6lb or a 10lb baby will feel like. So really it doesn't matter JK???
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#8 of 16 Old 02-12-2009, 11:58 AM
 
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It is very often inaccurate by several pounds. I wouldn't worry about it. Also, even if you think (or the doctors tell you) you look HUGE from the outside, that is not a reflection of the size of the baby, just the way you carry. Suspected big baby is often used as a reason to induce and more often than not, the baby was a lot smaller than they thought.
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#9 of 16 Old 02-12-2009, 01:25 PM
 
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As the others have said, totally inaccurate (and I think it should be illegal to guess ...I mean, all it does is stress out the mamas! And provide fodder for an OB to state that you have Cephalopelvic disproportion when it's very rarely truehich is what happened to ME and I wound up with a csection)

having said that, my smallest baby was nearly 8lbs, and my biggest was 11lbs. There was no difference at all in birthing them (okay, slight difference because the 11lb baby had her arm up over her head BUT Rachel was 10lbs 10oz and she was really no harder than my smallest)

Notice I said birthing, and not pushing? Pushing really works against birthing, because when you push, you are tightening all of those muscles and working against your body. It also reduces oxygen to your muscles and the baby. Sam, Dan and Ava I could not push hard with, due to heart problems, and it makes a big difference. You might look here for descriptions of different breathing.

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#10 of 16 Old 02-12-2009, 03:40 PM
 
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Overall, I'd say innacurate, but it depends on the doctor's experience. My OB (whom I just love to death and is awesome beyond words), is incredibly gifted at his job and has many, many years of experience. He's nailed it every time with my babies. I'm always amazed by his accuracy.
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#11 of 16 Old 02-12-2009, 03:48 PM - Thread Starter
 
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This is making me feel a bit better, thanks ladies

And thanks for the awesome breathing link, Multimomma!
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#12 of 16 Old 02-12-2009, 04:41 PM
 
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Originally Posted by Devaskyla View Post
Head size & shoulder width are way more important than weight, imo.
Totally. It's about head circumference and shoulder width. 14" is average for a head, with girls averaging slightly smaller and boys slightly larger.

Vanessa - aspiring Traditional Foods momma of Graham & Margot
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#13 of 16 Old 02-12-2009, 04:47 PM
 
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I had a u/s yesterday and it was showing baby at 5lb9oz and I'm 34 weeks. It's right in line with me having a 9-10 lb baby, which I expected from the get-go. Even if it is correct, and baby gains 1/2 lb from here on out, your baby may weigh 9 lbs at term, which is totally do-able. You'll be fine! Don't ask about size again though if you don't want any more freak outs.
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#14 of 16 Old 02-12-2009, 05:22 PM
 
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About a week or two before DD1 was born my midwife estimated she was already about 8lbs. When she was born at 38 weeks she weighed 5lbs 10oz. So yeah... I don't trust any weight estimations.
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#15 of 16 Old 02-12-2009, 10:17 PM
 
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I do not believe them at all. My uber-experienced midwife guessed DS2 to be about 7-8 pounds the day before I had him and she was out by a pound. He was 8 13. No one else would even guess.

Bigger babies, from what I have been told are easier to birth as they are softer and have a larger bulk for your uterus to work with. It is the head size and shoulders that make a real difference in vaginal rings of fire.....
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#16 of 16 Old 02-12-2009, 10:33 PM
 
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Quote:
Originally Posted by Nomadmama View Post
I had a u/s yesterday and it was showing baby at 5lb9oz and I'm 34 weeks. It's right in line with me having a 9-10 lb baby, which I expected from the get-go. Even if it is correct, and baby gains 1/2 lb from here on out, your baby may weigh 9 lbs at term, which is totally do-able. You'll be fine! Don't ask about size again though if you don't want any more freak outs.
Just as an FYI, u/s is the LEAST reliable predictor of birth weight. It can be right, but it is also often a pound or more off.

As an aside on the topic of baby size, I read a really interesting article on suspected fetal macrosomia, let me see if I can find it. ok here it is: http://www.aafp.org/afp/20010115/302.html. One interesting item is that shoulder dystocia occurred in smaller babies as much as in big babies. Overall, they say that the possibility of a big baby should be expectantly managed and not intervened with induction.

Alicia, wife to an loving and faithful DH, and mama to three fantastic though nutty children (cs, then an HBAC, then a VBAC!!).
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