Your pup looks all GSD to me. And could easily just be on the petite side for the breed. I've seen males and females who never got bigger than 50-55lbs. All healthy. No problems physically. Just on the smaller side of the scale. Litter sizes can range just as the pups sizes can range. Usually there is some uniformity but sometimes there isn't. Your pup appears to be about 8-10 weeks old.
Just socialize, train, and love your pup. Don't stress on what the weight charts all say. Physically, your pup looks healthy and at a good weight for it's size which is what's important. Weight means they're growing but more importantly, you want to make sure your pup is at the right size for their stature. Don't count the lbs. Count how they appear physically. You want a slimmer pup so as not to stress growing joints.
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