https://arstechnica.com/tech-policy/2020/03/with-demand-surging-amazon-signals-month-long-deliveries-for-some-items/

As the coronavirus has forced millions of families into lockdown, demand for Amazon's delivery service has surged.

To help the company deal with rising demand, Amazon has prioritized several categories of essential items, including baby products, health items, and pet supplies. The results of that policy can now be seen on Amazon's website: numerous items now take weeks to ship. That's true even if you're a subscriber to Amazon Prime, which is supposed to provide two-day shipping.