How Much Should A Seven Month Old Pitbull Weigh?

My 7 month old male pit is mixed with rottweiler and weigh 48 lbs

My female bluenose weighed in at 46.3lbs at 7 months, she hasn't been weighed since but id say shes about 50 pounds now.. As she is getting close to 8 months. I have no idea if that is average, but she is a very stalky and very muscular. Her parents were also very stalky, but weighed quite alot, her father was 80 pounds an her mom was weighed in at 72 pounds before they bred her. They both have papers as does my puppy, her father was even put into dog shows... But again she may be bred somewhere down the line with something else as alot of ppl will say that.. But i could care less, shes healthy and happy which makes me happy.