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What 'should' a baby weigh at 36 weeks?

(21 Posts)
cat811 Wed 13-Aug-08 15:53:19

Just had 36 week scan, and seen on my notes that the estimated foetal weight is 7lb7oz - does this seem big bearing in mind I have 4 weeks to go?!

aurorec Wed 13-Aug-08 15:58:17

Well in the last few weeks they are supposed to gain about an ounce a week, so that's not that much more- mine was 7.3 at 34 weeks so it works out reasonably similar.
If you add your 4 weeks that means an 8 pounder which sounds rather good to me.

Anyone else?

(by the way those estimates are often very wrong anyway- so you could find yourself with a way smaller- or bigger baby)

PortAndLemon Wed 13-Aug-08 16:03:09

DD was estimated at that big at 36 weeks, and she was 8lb 15oz at birth.

On average they gain half a pound a week in the third trimester I think (at least that's what I've always gathered, and it's born out by graphs of fetal weight at various gestational ages... haven't come across the one ounce a week figure), so that would imply somewhere around eight and a half to nine pounds at delivery.

belgo Wed 13-Aug-08 16:03:55

You have to remember that those estimated weights can be way off.

PortAndLemon Wed 13-Aug-08 16:04:01

But agree growth scans are notoriously inaccurate (they have been spot-on for both of mine, but I'm about the only person I know in that position).

lauraloola Wed 13-Aug-08 16:54:54

They told me on a 34 week scan the dd was weighing 8lb!! She was born 1 day early and was 7lb 1oz!!!

LeonieD Wed 13-Aug-08 17:52:28

Message withdrawn

BlueJellie Wed 13-Aug-08 18:11:55

I'm curious, how do they estimate the baby's weight?

cat811 Wed 13-Aug-08 19:16:32

Good question! They didn't mention it when they scanned me, just happened to be reading through my notes afterwards and saw it at the bottom! it's a mystery to me!

PortAndLemon Wed 13-Aug-08 19:46:53

They measure several things (can't remember exactly, but I think head diameter/circumference, abdominal circumference and maybe femur length) and feed them into an algorithm that estimates weight. There's a site on the web where you can do it for yourself (given the right measurements), if I could only remember where it was.

madmarriedNika Wed 13-Aug-08 22:47:02

That does seem to be a good weight My DD was born at 36 weeks and weighed 5lb 8oz- she was on the 25th centile.

But such weights by scans are estimates so I wouldn't concern yourself too much by them- only if the doctors are concerned would I get concerned!

Good luck for the next few weeks!

ChasingSquirrels Wed 13-Aug-08 22:49:06

mine were both born at bang on 37wks, both weighed 7lb, give or take half a an oz.

kyme Thu 14-Aug-08 02:30:29

both my girls were born at 38wks
1st 6lb10

my daughter who is 4weeks weighed 5lb3
but they were worryed in my growth scans a week before i had her i had a scan they said she was 5lb12 in she was less..
she now at almost 5weeks weighs 7lb12


fernie3 Thu 14-Aug-08 07:54:57

My son was born at 36 weeks exactly and weighed 5 pounds 8.

I was ALSO born at 36 weeks and weighed 7 pounds 5 ! so i think there is huge variation probably all normal.


oooggs Thu 14-Aug-08 08:20:11

ds1 was born at 36+4 and weighed 7lb14oz
dtd was born at 38 weeks and weighed 6lb 14oz
dts was born at 38 weeks and weighed 7lb 14oz

herbietea Thu 14-Aug-08 08:24:18

Message withdrawn

bikerunski Thu 14-Aug-08 10:42:41

Kyme goodness, I read that as your daughter weighed 1 stone 6 lb 10oz, not that your first daughter weighed 6 lbs 10oz!

cmotdibbler Thu 14-Aug-08 10:44:54

DS was born at 35 weeks exactly and weighed 6lb 5oz.

kyme Fri 15-Aug-08 09:41:29 confused what do u mean?
you read what???

hertsnessex Fri 15-Aug-08 09:56:47

both of mine were born at 36wks, one was 5lb 12oz and the other was 7lb 13.5oz.

they dont put on an ounce a week - its around 1/2 - 1lb.

missjennipenni Fri 15-Aug-08 16:31:58

My DS was born at 35 weeks weighing 5lb10oz, which i was told was a really good weight. does that help?

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