So sorry this is happening
I did have to change my opening activities. We always have something very fun and tactile on the table that the child will be drawn to which helps. I also asked parents to limit their time at drop off..... and told them if their child needed extra cuddles, love, etc. they are welcome to read a book to their child on the porch.
I would not allow a child to hurt me or put me in a position of being hurt.