Hi My son is 3 and a half, 17 kilos and 104cm I believe. His fingernails and hair never seem to grow much- they are lucky to need a trim in 6 months, is this abnormal? He also complains of painful legs and sometimes does not even want to walk. He continues to get cold after cold but is a otherwise happy boy. He is active and does karate 3 times a week but doesnt run around otherwise, just walks. He has tummy cramps off and on and is increasingly fussy with his food.