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If you had a small 9-year-old boy, what is their adult height?

103 replies

Heightyheight · 14/02/2023 20:59

My DS (age 9) is the one of the smallest boys in his class - there’s maybe one boy smaller than him.

He’s always been small - he was a small baby. It’s never especially bothered him, but he’s started saying things like “I’m going to be tall when I’m older though”. I think it’s because his dad is tall 6’2. I am smallish (5’3.5 - the 0.5 is important!)

He’s convinced he’s going to be tall like his dad someday, but I am not so sure! I keep saying “Who knows what your height will be! Some people are small, some people are tall and we all grow at different rates.”

So, just wondering… if you had a small DS at 9, did he stay small?

OP posts:
lljkk · 05/01/2025 10:07

imnotwhoyouthinkiam · 04/01/2025 23:37

We looked at that half your adult height at 2.5 thing when DS2 was about 2. Worked out he'd be 5ft 3.

Apparently it's true in most cases.

Completely not true for all 3 of my boys. All are taller than predicted. My daughter was supposed to be 5'2 max... she is adult 5'7"

ViciousCurrentBun · 05/01/2025 10:58

One of DS best mates has a 5ft Mum and a 6ft 1 Dad. He was always small. He is fully grown at 23 at 5ft 5, his brother is 18 and is 5ft 6 and could still grow.

One thing is make sure he gets plenty of sleep, that’s when growth hormones are released. It’s the reason I comment on height threads becuse I don’t think that’s a well known fact. I also know his short mate is a terrible sleeper.

WobblyLondoner · 16/01/2025 22:52

TwoBlueFish · 14/02/2023 21:24

My DS stayed small till about age 16. He’s now around 5’10” or 11, taller than his Dad and still growing (he’s 18.5). My youngest brother was also the smaller for many years and is now well over 6 foot and the tallest of all my brothers (all 6 foot +)

Mine was similar - very petite until he was about 16 (I remember one primary school photo where he was almost the shortest in the year) and then rocketed. He’s just shy of 6 foot now, much taller than me or his dad.

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