What's in the water

I just heard about another new baby born last Sunday. To someone I know of course. I can't remember when I was aware of so many babies due or recently born since I had my own second child. And that made sense because it was all in the same circle of people who already had first kids all about the same age. Three years, a classic separation. This new baby boomlet is just random - parents not the same age, not in the same area, just people I keep coming across. Feels like a brand new generation. What will be the hallmarks?