Why does Stwie have a huge đít, mông, ass head? XD

He used to have a normal-sized head until he hit it hard on the ceiling while jumping on the bed. He hit his head so hard that it became football-shaped.

because on the episode with MC on it, Brian might đã đưa ý kiến that he has asmia, (however bạn spell it) but he might be able to have that head round, but that is his normal size, that's why he has a big a** head

depends on the episode