I may just be being silly, but i've just realised he's only grown 2 cm's since July. He 33 months and 89cms. according to google they should grow 6 cms in a year so unless he's going to suddenly jump 4 cms in 4 months.... i'm not exactly really tall and neither is dh (5.4 and about 5.9) so i'm not expecting ds to be a giant but shouldn't he be growing faster than this?