1. How tall are his parents?
2. How tall was his father at his age?
3.Does he have any older siblings, if so how has their growth compared?
I just ran the numbers and talked with another doctor. You son is well within normal limits of growth. Yes, he is small but it is nothing to be concerned about. I personally was an inch taller than you son at the same age and just a few pounds heavier. I'm now 6 foot 250 lbs.
If you still have concerns I would suggest an endocrinologist. Endocrinologist can prescribe HGH in a manner that will stimulate the human body to grow. This is something most that I know would want to wait a couple of years to use but if you bring it up now they can start the process if that is an avenue you wish to pursue.
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Have you seen an endocrinologist or just the gastroenterologist?
I personally don't know that the chromosome study would do you much good, and a feeding tube is very extreme.
My personal judgement on the issue would be to wait another year and if he has not broke the 62 inch mark start HGH.
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