“Why not test infants and find out which of them could take more in terms of stimulation?”
This line made me laugh. From my limited experience with DS, a child who can take more stimulation might just outright demand it. In DS' case, vociferously. He literally screamed for 5 hours straight or longer at night when we tried to settle him. Most nights, I was up until 2 or 3am with a 3 or 4 month old who insisted on books. At 5 months, when he said, "read book", we clued in that he wanted to be read to the whole time instead of sleeping, and everything fell into place nicely (including sleep). No test needed. We eventually found an alternate settling routine: running through the house carrying DS, naming everything in sight in rapid fire speech, usually for 20-30 mins.
So, while DS may not be a typical case, he's an example of the lengths a highly motivated child will go to to secure sufficient stimulation!
