Big head son, little head father, big head son in the movie is ill and in hospital. If he doesn't eat, what kind of injection is it?

Hello, you are asking which episode is Big Head Son, Little Head Dad, and Big Head Son who is ill in hospital and doesn't eat or have an injection? Big head son, little head father, big head son in the movie is ill and in hospital. Giving him an injection without eating is 15 episode. In episode 15, Big Head's son was greedy for air conditioning and caught a cold. You need an injection when you get to the hospital.