An easy way to check your child’s ideal weight is through this great site
http://www.kidsnutrition.org/bodycomp/bmiz2.html
It will also show the ideal calorie amount for weight maintenance. For weight loss in children, consult an Accredited Practising Dietitian (APD) for an appropriate plan.
Find an APD at http://www.daa.asn.au/dmsweb/frmfindapdsearch.aspx