Luca Enna, 4, knows that when his best friend - who has a blood condition - gets hurt on the playground, he must tell a teacher fast.
"There's a room that has plasters inside it, in a little box, and only teachers can go inside that room," Luca explains.
"I can't make him feel better ... so every time Henry gets hurt, I just come and get a teacher and tell - and then I give him a cuddle."
Luca's best mate, 5-year-old Henry Smith, has von Willebrand disorder, a condition that affects the body's ability to form blood clots.