Height and weight

I have a question i had a letter today from the NHS for aimee as they weigh and measure the kids at school now and they said she will have to be reviewed in 6months with height and weight. They have posted me the height and weight for her but no explanation if shes under or over weight? Does anyone know the 'textbook' answer as they seem to live and breath it! It really annoys me i am yet to meet a child that goes by THE 'book' Thanks x x x
Height 99.7cms
Weight 17.8 kilos (2st 8lb)

I've got no idea. If your not worried about her and feel she's ok then i'd just wait to hear. If not i'd pop into the school or doctors and speak to them.

Jessica was 2 in october and has just gone into 2/3yrs clothes. Not a clue on what she weights.