TracyK your GP could weigh him, but TBH I didn't get dd2 weighed after her 6 week check until she was about 9 months. Then again at her 18 - 2 yr check. I really wouldn't bother unless there is an underlying need to do so.
DD1 on the other hand was weighed weekly until she was about 7 or 8 months old. She was prem and it was important in her case as she also had bad reflusx and didn't digest food. In this case we needed to make sure she was gaining weight regularly. Otherwise it was a pain.
Thanks ladies - I don't have any real reason to have him weighed except out of nosiness.
He's 1 year old on Sunday and would like to have him weighed and measured at this point out of interest.
Will maybe pop into the vets - they do have scales in reception - can pretend to buy some dog food.