The average weight for a 6 year old girl is 20kg.Your step-daughter's weight is seriously below this average weight and she is in the lowest 2% for all girls of her age with her weight.It is imprortant for her to be checked up by a doctor to be sure that she is well. Once this has been done and if she is found to be healthy then it would be a good idea for her to be seen by a child psychologist.
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