I am a youngest child, and I endorse this video.
Birth order is one of those things that I think is really fun to look into but, in the end, isn’t exactly the most useful bit of information.
When I was younger, a relative had a book that really got into it based on sexes, too. I’m a youngest born, but I’m the only female. So youngest-only combination. Whereas my next sibling up is middle born but youngest male.
Yeah, this stuff can get really complicated if you want it to be.
Anyway, it still is pretty fun to take a look at it.