The average weight for a boy of 19 months is 11 kg and the average height is 83 cm. Your son's height is exactly on the average, but his weight of 10.1 kg is obviously well below the average. In fact his weight is on the 10th percentile line of the children's growth chart. This means that he is in the lowest 10% group for boys of 19 months. This is well below expectation and cannot just be put down to him possibly having tall, but rather slim parents. His tonsillitis episodes can certainly affect him especially as this can interfere with his appetite. It would be worthwhile getting an opinion from an ENT specialist about your son's tonsils quite soon. His appetite certainly appears to be poor. In the meantime it would be best to try him on Pediasure to boost his weight.
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