Just wondering if he looks a good size he is 4 months old?
Also does he have a nice size head will it be big and blocky I have been told his muzzle Is a bit long his dad has a real big head with short muzzle mom is good as well.
Here's a few pics of him.
I've just answered another owner of a 4 month old Rottweiler pup (female that time) who had the same question!
As I said there, it's important to remember that a 4 month old puppy is a baby... and that Rotties are slow to mature and develop. The bigger the male, the later he matures in my experience.
Your boy looks good and his muzzle looks fine, he's got nice thick-set bones from what I can see and his color is good. You won't really see how his head is going to fill out until he's much older, and from now until he's about 18 months to 2 years (or even longer) he's likely to look quite out of proportion and gangly, maybe even a bit skinny, as he'll be an adolescent. My biggest male looked like a 'bobble-head' toy for quite a while :o)
He will get his full height before he has put on all his adult weight, so bear that in mind and be patient. A Rottweiler is an incredible dog and is so much more than the size of his head, or shape of his muzzle! They truly have the heart of a giant and all your little guy needs is lots of love and attention, loving discipline, proper healthcare and an excellent diet in order to grow into the adult his genetic 'code' allows for.
Best of luck with your pup, I think he's going to be a very handsome adult.