The average weight for a boy of 20 months is 12kg. Your son's weight is well below this average weight and he is significantly underweight. So there is definitely a problem here.Many children of this age may go through a period when they do not eat well, but your son's poor appetite is worse than usual. Also he complains about a tummy ache at times.It would be best to take him to see a paediatrician so that the reason for his problem can be diagnosed.
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