Talk

Advanced search

Can someone explain weight percentile to me please?

(13 Posts)
Nottalotta Wed 02-Dec-15 05:03:00

As i always understood it to mean (and have read on here) that if DS was on the 25th, out of 100 babies of the same age, 75 would be heavier?

In which case how was he on the 25th when he was 9lb 1 at birth? Confused!

KaluzaKlein Wed 02-Dec-15 05:22:39

That's about the 75th percentile. 25th is about 7lb...

www.cdc.gov/growthcharts/data/set1/chart01.pdf

American charts , but the eu ones are sinilar

Nottalotta Wed 02-Dec-15 05:27:44

That's what i thought but it definitely says 25th for each weigh in until this week which was 50th at about 16lb 3 at 4 months. Hence my lack of understanding!

GreenSand Wed 02-Dec-15 06:19:39

He wasn't on the 25th centile at 9lb+ at birth.
He might (unlikely, I'd have thought) been on the 25th centile by a 6 week check, but that would have raised eyebrows and triggered questions by a decent HCP.
Mine were about 7lb, 25th centile, and 8lb, 50th.
Are the numbers plotted on a graph? That can help you to see what's going on.

GreenSand Wed 02-Dec-15 06:20:02

Are you in the UK?

WorldsBiggestGrotbag Wed 02-Dec-15 06:29:47

Mine was 8lbs 8oz and on the 75th centile at birth. She was 12lbs 5oz at her 6 week check and up to the 91st.
Are you looking at the right line on the chart? They can be a bit confusing.

Nottalotta Wed 02-Dec-15 08:08:40

I Will have aother look but the even said 25th. And last week he had 'gone up to the 50th'

There was also a big fuss when he lost weight. T

I didn't think it made sense!

Nottalotta Wed 02-Dec-15 08:11:07

Yes I am in the UK.

I'm not normally this dense! He's very long,.do they take that into account (he looked skinny for ages)

KaluzaKlein Wed 02-Dec-15 08:39:47

Yes they plot all three measurements separately.

How odd. Talk to whoever is putting the numbers on his chart. It sounds like they're using it upside down but surely that couldn't happen...? Could it...?

tiktok Wed 02-Dec-15 13:09:55

Perhaps they have recorded the weight incorrectly or told you the weight incorrectly or translated metric incorrectly.

squizita Wed 02-Dec-15 13:25:46

It's a data entry error so to speak. My DD was on the 25th at 6 lb 14oz at birth.
And a hurried HV had her leap to the 50th a few months before. I looked and they'd plotted the graph wrong, I rang up and checked, and they re-plotted it next visit. smile

Nottalotta Thu 03-Dec-15 03:42:06

I've checked the book. The birth weight wasn't plotted, the first one was after he had lost weight and although that time and the next three weighs the HV said he was tracking the 25th centile, its actually just under the 50line. Last week the HV said he had 'gone up to the 50th' its actually halfway between 50 & 75. So that makes more sense.

lullaby23 Thu 03-Dec-15 05:30:49

OP I like this website as am too dim to plot graphs smile (also not in UK so don't get the same book):

www.paediatrics.co.uk/nicu/growth-charts

Join the discussion

Join the discussion

Registering is free, easy, and means you can join in the discussion, get discounts, win prizes and lots more.

Register now