At 14 weeks and 12.3kg, he is a pretty good weight, a general range for a 12 week old is between 10 to 14kg with 12kg being the average and a 16 week old is between 16 to 18kg with 17kg being average. He is just at the lighter end of average weights which is perfectly fine, don't forget they do grow differently and so long as he is healthy, he may have a bigger growth spurt later on.
However, it is important to grow your GSD puppy slowly that way you may lessen the change of medical issues occurring such as dysplasia. It takes a good 3 years for a male GSD to fully fill out. He will finish in height growth around 9 months but may gain an extra cm by 15 months.
Keep an eye on him and make sure he slowly and gradually increases his weight. If you start to notice at any stage that he has stopped gaining weight but still eating and his stools are not healthy then consider testing him for EPI.
But to me, it sounds like he is a perfect weight. A good way to know if they are too fat or thin is to look at him from above - he should have a nice trim waist and look at his sides - you shouldn't be able to see ribs, feel his sides - you should be able to feel his ribs through a nice thin layer of fat.
Post some pics for us to see.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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