I think its high if it runs over 126 which is considered diabetic , but maybe hes had some sugary drinks , candy ? there is a diabetics forum with some knowledgable folks there may help you more ,
Is he getting this checked by his Pedi Dr? I'm not sure if a babies sugar should be the same as an adults but if it is then yes, that's too high.
Is he having any symptoms like drinking alot of liquids all the time?
Please let us know if it was his Dr that gave you his sugar reading. Take care. Remar