I have an issue with making the little ones sit at the table while the older ones do crafts too in the sense that physical skills are the first to be developed and they need to be down on the floor working on their gross moter and indirectly their fine motor and they manipulate toys. When they have mastered this they will have the muscle control to do and enjoy the crafts. This also solves the issue of eating the supplies. How do you explain to a one year old in a high chair that an orange carrot is for eating but a similar looking orange crayon is not. I so feel it is an inappropriate activity for the one year olds. I know I am in the minority in this but it is something that would solve your problems. This could be the time that you let the babies loose with blocks on the floor and the big kids out of their way.