The average weight for a 4 year old boy is 16 and a half kg.Your son's weight of 18kg falls on the so-called 75th percentile line;this is in the top 25% for boys of his age.The average height for a 4 year old boy is about 103cm.Please measure him again and let me knowhis correct height. The height you have given here of 140cm is completely off the chart.
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