Lately, all of Ryan's questions and demands end with "back." "Can I have milk back please?" does not mean he had milk earlier in the day and wants it again; when stated first thing in the morning, it just means he wants milk. "Can I have blanket back please?" in no way implies I took his blanket away from him; he just wants to find his blanket.
I like to think of this as a window on his mind. Perhaps he has a more fluid understanding of time than I do. Milk is, milk was, milk will be, all at once.
Or maybe he's just learning the language.