"Via his website he surveyed more than 1000 parents from around the world, asking them questions about when, where and why their babies laugh." I hope this is

"Via his website he surveyed more than 1000 parents from around the world, asking them questions about when, where and why their babies laugh." I hope this is just confusion through the lens of the BBC, but... It sounds like they had people self-report when they observed babies laughing, and found that babies laugh when being observed?