I pretty much only get two day shipping if I go into the chat and ask for it. Been a Prime member for years; I just went to look at some more baby stuff being sold by Amazon - overnight is guaranteed by Tuesday, 2 Day Prime Shipping is Thursday. Amazon is pretty good about "making an exception" if I open a chat with a rep and call them on their bullshit. I make four or five Prime purchases a week, and rarely do my goods get a guaranteed date of 2 days. (They often show up in two days, but that's not the same thing.)