The average weight for a 9 year old boy is 28kg, so your 9 year old son is just slightly below this average weight. The average weight for a boy of 7 years is 23kg, so your 7 year old's weight appears to be very far above average.
I am happy with your son's diet with the exception of the snacks at the after care all of which, including the liquids appears to be most unhealthy. You need to speak to them and ensure that they give the children healthy snacks while they are there in the afternoon.
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