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Thanks for your follow up.
We have three positive findings. One laboratory and two symptoms. So your son has hypothyroidism which means that his thyroid gland is not forming enough thyroid hormones responsible for body metabolism. Thyroid hormones deficiency is not responsible for the growth, so, less likely to cause short stature directly but as I said the whole body metabolism will be affected so the height could be affected indirectly over time if not corrected.
We start with 25 mcg Levothyroxine tablet per day for one week then 50 mcg Levothyroxine tablet per day and repeat TSH (thyroid stimulating hormone) level after one month and dose can be altered accordingly. The dose has been calculated according to the body weight (40 kg). Medical follow up is required. Please let me know if you have any further questions or concerns.