half birthday cake??

Anyone getting their babies a half birthday cake?? If so.. are you going to let baby smash it/eat it??? I'm a FTM and I really wanted to get him a cake for his 6 months but.. I don't think he can eat it?? He's still just eating puréed fruits and veggies.. and has only tried a few of them.. so idk how him eating cake would be ok?? 
Should I just have the cake but not let him smash it or go near it?