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Category: Symptoms & Discomforts

Asked by Barbie

Q: Baby weighs 4 lbs at 31 weeks?

I had a 3D ultrasound done at 31 weeks and he was 4.2 lbs.
I looked it up and the average weight at this age is 3.75lbs.

Is he going to be a 9lb baby? I'm asking because I was a big baby and my mom had struggled to push me out lol

This question was asked Feb. 28, 2013 1:36am
Category: Symptoms & Discomforts

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Answered by LalaRiley - Mar. 1, 2013 4:22am
I agree with previous posts. Ultrasounds can be off, but baby could also gain more or less in the coming weeks and it could all even out before birth. Average weight means there are still a LOT of babies that weigh more or less!

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Answered by Metal_Yuri - Feb. 28, 2013 3:38am
It varies. Ive heard of babies coming out lighter then what was stated via ultrasound.

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Answered by Addie02 - Feb. 28, 2013 3:10am
Two things:

1) an Average weight is just that, an AVERAGE, meaning there will be babies a little bigger and a little smaller than that. So a little above or a little below is to be expected, and is not unusual.

2) Ultrasound weight estimates are NOT that accurate; usually only +/- 1 to 2 pounds, which is a ridiculous margin of error when you consider that the baby only weighs a few pounds to begin with.

I wouldn't worry too much about it, as it's pretty much impossible to know whether baby is going to be "too big" to have a vaginal birth until you try.

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Answered by Barbie - Feb. 28, 2013 1:37am
Sorry, average weight at 31 weeks is only 3.3 lbs!

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