No one can give you a exact answer on what your pup is by pictures. If the parents are registered then you can find out. There are a lot of threads on this topic, I know I made the same mistake. Your pup is very cute.
Personally I suggest calling it a mutt unless you plan on showing. Or a "pet bull". But for a good amount of the public, pit bull has a bad rep.
I understand wanting to know, my boy is a amstaff but the breeder wont turn over his paperwork or even give us his lineage so I can look him up. So I am getting a LP with the UKC and some other places so in like 8 months or so I can start competing in WP.
Welcome... you'll never know without papers.. he could possibly be full blooded but then again he could be a complete different breed.. the looks of a "pitbull" range and vary in so many ways its hard to categorize the mix breed.. he's a cutie whatever he is.. luv them ears!