Charles Krigbaum, SAA teacher trainer, demonstrates with his student the "Rhythm with Three Fingers" He has already worked on the rhythm and the rests, on secure finger placement and on sound. This took several weeks or months.
During this time he reviewed ALL pre-Twinkle songs and exercises he learnt already and prepared the next songs (see STEP by STEP, vol. 1A).
One other important step to learn for the child is:
"Wait until you’re ready!" (preparation before playing)
Prepare yourself before playing. Check your feet, your violin hold, your bow hold, and your left hand. When everything is prepared, can you say to yourself: “I’m ready!”