My nearly 9 month old Staffie has quite a small head, do you know if it will get bigger as he gets older?

I should think so, my staffy will be 3 in december and his head has really just started to get bigger, you dog is still ver young plenty of time I would say,

The age the head 'splits' seems to vary from dog to dog, mines just 2yo and his is only just starting to widen a bit...good job really is necks wider than his head LOL :D Yours has plenty of time yet, he's probably only just started to bulk up at 9 months. Just enjoy your dog and dont worry too much about whether or not he looks like 'a proper staffy' :)

Staffies heads dont  "split". Not that i'm aware anyway

that just seems to be how most ppl refer to how their heads widen, hence the ' ' marks :)