I used to teach a bunch of kids in Kandivli... it is great fun though exhausting to teach children because they cannot hold poses long and need to be taught several things all at once. Also, u need to demo the poses as they do, so they will follow by watching (rather than listening): so a one-hour class could mean 20 poses or more!! But I used to tell them yoga stories, give them little stories on yoga moral (the two ang of yoga, yama and niyama) and the most wonderful thing was they were all so open to the idea of goodness, being moral etc.... It excited them...u could sense that.
Since today's class was lighthearted we dispensed with the nidra but I insisted on the prayer, and as we said Om, the tot sat down very seriously, scrunched her nose with great care, drawing a deep breath before chaniting Om with us. Even as we said the prayer, she kept this little ritual on, so cute and beautiful, and displaying again how children love religous, spiritual rituals:)