bang himself again!!

Yesterday he bang himself to the pillar, caused a big bump near his eye.
Today, already told him to be careful; and i kept repeating to him that he's not allowed to play outside.
He refused to take a nap, i knew he was tired.
He saw his brother opened the gate, he dash out like a bird getting free, and he can't see what was in front of his way. "Bang!" straight to the pillar. "Ooo... Told you."
He was quiet after then. I had him sat in front of me, in my arms.
"Are you sure you don't wanna have a nap?"
"I want now."
"okay, nap for a while while waiting for mummy,"
an he fell asleep in my arms with his sitting pose.