Toddler is 2.5 and generally happy and healthy. This week he's started to say "I don't feel well" repeatedly and looking to go sit down. He seems completely fine otherwise bar a slightly runny nose no temp etc. I've asked where in his body he doesn't feel well and he can't answer this. Asked if he feels sick or sore and he says no. But he keeps bringing it up. Any tips on how to know if this is something he's just picked up and is pretending or if he actually doesn't feel well? He's saying it even when he's having fun and playing which is why I'm wondering...