If your son's height is indeed 83cm then he is extremely small for his age, so much so that his height is below the lowest line on the children's growth chart.Oddly enough his weight is also far below the average for a boy of his age [average weight:14kg] You may be measuring his height incorrectly.You need to measure him from the top of his head to the soles of his feet and this is best done with the height measures found in paediatrician's rooms.If you have been measuring him correctly and his weight is correct as given here then your son growth is well below expected and is very unusual in a tall family like yours.Please take him back to the paediatrician for his height and weight to be carefully measured and charted on the children's growth charts. Do not leave the rooms until you know exactly what the situation is with your son's growth. If he is indeed as small as the measurements given here he must be examined and tested for conditions that cause poor growth in children such as coeliac disease.
He is getting enough calium in his diet. He needs about 2 cups of milk per day.Get the 2% milk for him.
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