Thanks Everyone, exactly what I thought totally normal.

I also called the child care and spoke to them. It turns out the message I got from my MIL, who picks him up for me, was wrong and that the child care was only asking if there was any interests that would distract my DS, as he doesn't like them to change him. Also, as my boy is quiet larger than a normal 2 1/2 (he's about 26kilos but over a metre tall), they have trouble lifting him to the change table. So we have agreed to put the change mat on the ground until he is comfortable with them.

So glad I called and a bit annoyed at my MIL for not being clearer... Anyhoo you have help me greatly and provided me with reassurance that what I thought he was doing was normal...
Thanks.