My son is still placing everything in his mouth and I wanted a fun activity for him to sit and do and still be safe so we made chocolete instant pudding (you can use any flavor) and then taped a piece of construction paper to his highchair. You just let them start "painting" the construction paper and eating it too. You can help them write their name in the pudding when they are done and then just let it dry. There is a picture of him doing the painting on my "toddlers" website. He had a great time with minimal mess to clean up.