I'm wondering if kids change their disposition.

Thinking through, my son was an introvert through 6. I offered to have more than one playdate a week when we were homeschooling, but he didn't want it. And yes, he was always so quiet after each playdate. At the time, he said he needed to be alone because he had projects that they wouldn't be interested in.

This year, entry into a big school seems to have changed him. He's very interested in playing with kids, but mainly for active games. He's actually reading less, and in fact, reading books that are the level of what his school mates are interested in (Geronimo Stilton) rather than what he used to read. He's stopped a lot of his own interests too, like little experiments he used to carry out around the house.

While the social angle is good, I'm a bit distressed that he thinks he has to change himself to get more friends. I'll try to encourage him towards his old interests, but am confused by all that is going on.