It is time for new vocabulary

Richie is gaining his strength back after some tough days. He was down with gastrointestinal problems and high fever for 5 days continuously. But I am happy he is trying his best to be back to his normal health. He feels hungry most of the time and demands for food by crying loudly.
Nowadays, he goes "koati-koati, bu-bu for aeroplanes, ba-ba for sheep, hey dada (calling out to dada),pa-pa, wa-wa for water" etc.