ok one question WHERE ARE THE TEACHERS when this is going on. as much as teaching and making them understand (I mena the kids) the teachers have to see and recognise what is going on. How sad that your child should experience this at such a young age and for the teachers to over look the problem. I would in your place talk to who ever is in charge but make sure he is ok with the outcome the last thing you want is to "sort the situation" but for him not to have many friends and hating school. If its an option change school.

These girls are probably only 4 as well.  I would try to work out with the teacher some things he might be able to say or do to protect himself from them and to maybe put a stop to it that way.  It's a hard one when the children are so young, although they certainly know what they are doing! Maybe get the teacher to call the parents of the other children and have a conference, as they may be at a loss as to what to do about it.  This is what worked in my Prep class at daycare once when we had trouble with 3 of the children 'ganging up' on another child. They never became friends, but it put an end to what was going on with them.  It's very individual though so whatever you do will be unique to your child and the other children and that situation.  Good luck, fingers crossed.

I would talk to the teacher and tell her she needs to control her class. These children should face serious consequences for acting in this horrific manner. If you don't get this to stop by having a talk with your childs teacher, I would go then to the principal. Children need to learn to say something nice or say nothing at all. I am sorry for your son's feelings being hurt. I would not just accept this (as you are not) even if it takes some fighting on your part (not literally, but you may need to push the matter if the teacher isn't making it stop on her own). If this doesn't stop, I would request for him to be put in another class. Good luck to you and your son.