I would not use batting at all. It is very hot and humid in Haiti. For the small children, I would use flannel only with the edges serged or hemmed. For the older ones, I would do quilt as you go. In that way, you would not even have to tie them. I would cut the fabric in 5" pieces and sew it right to the backing. Try a piece and see what you think. I believe fleece would be very hot in that climate. Maybe you could do more research. God bless you in your teaching effort.