Dear Leo,
Owning a mouth is amazing. Opening and closing it, as you have already discovered, enables humans to make noises called language, which helps them to communicate with each other. It will be quite some time before you refine the art of making comprehensible noises, but for now you're doing just fine.
The other thing Mommy sees you have noticed is that your mouth contains tastebuds, and that different objects do not feel or taste the same when shoved hastily into it. Apparently this is partially because you have more nerve endings in your mouth than anywhere else in your body and, unlike us big people, you have tastebuds on the roof of your mouth.
Which is why Mommy is flummoxed by your choice of objects-to-be-mouthed. It is with growing distress that she has noticed that foodstuff is not included in this list.
