Well, now we're just getting May data and maybe June data. So that would be conceptions starting in August 2021. Here's a really lame screen capture of a visualization I just made with the CDC data. The August time frame is where we're passing 50% of the 25-39 year-olds getting vaccinated. So that would start to show up in the May 2022 birth data.
https://pasteboard.co/uhkdWFvhCf9c.png
edit: this showed up in my inbox during dinner - more evidence https://igorchudov.substack.com/p/new-data-from-germany-birt...