What should a 7 month old male Bouvier des Flandres weigh?

We have a 10 1/2 year old female and a 9 month old male. They are both between 90-100 lbs. I would estimate a 5 month old female should be between 30-40 lbs.

My 4 month old male weighs 32 lbs. He was smaller out of the male puppies, and his father isn't a big dog.