Well, I think you already know the answer to that. Using weight/height charts as predictors of growth for babies are highly unreliable. There is a formula that can be used on a two year old, but that is also a rough estimate at best. The best predictor of a child's future height, as HAK stated is genetics. Height determination through genetics however, is not straightforward because many genes come into play. Genes don't have the final say on a person's height though, as many other factors come into play, including nutrition, general health and well being, environmental factors, etc. Getting a severe illness during a potential growth spurt phase for example, has been known to stunt growth.
But if your SIL is happy at the prospect that she'll have a tall LO, I wouldn't quash her hopes just yet though ;) My DH for example is fairly tall (over 180 cm) although both his mother and father are on the short side. His dad is in fact shorter than me, and I'm not tall at all! He got his "tall" genes from his maternal grandfather. Just goes to show it's not even that straightforward with genetics!
<em>edited by lemondrops on 16/06/2011</em>
What can you say? Everyone's different!
My Red Book has a calculation to give the "adult height potential", so you could give that a go - it actually gives a fairly wide range of potential height and is hardly an exact science, but hey.
So. Add mum's height and dad's height together and divide by 2. For a boy, add 7cm to this figure, for a girl, subtract 7cm. This is the "mid-parent corrected height" (MCH). Have a look on the growth chart (the one that takes them up to 20 years) and mark on it where the MCH falls. The target centile range will be the MCH +/- 8.5cm.
I'm short... 5'1 and 3/4 hehe. DH isn't overly tall either... 5'10 but does the height of our kids mean much right now?
DS 3 1/2 yrs old isn't very tall and DS 10 1/2 months is about 30 inches.
When talking to my SIL (her boy is 5 month younger... 4 if I adjust my baby to what his due date was). And she goes on that her's is 22 1/2 lbs and 27.5 inches and oh he's on the high end of the scale and going to be so tall. Just wondering if it really means much at this stage. Oh and she's not much taller than me and her DH is the same height as mine if not a little shorter.
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