I know it’s likey I am Aibu 
but here goes
My friend is haveing a massive issue with biting her youngest biting her oldest like he gone Ferrell she has tried everything she is a excellent parent a bit hippyish but excellent
She is at the end of the line with ideas and I told her that it may not be a awful thing to let the oldest give the youngest a bit of a shove
I think the youngest is testing the pecking order Oder and I know sure having 3 myself how practical it is to be able to sort every incident they have herself
Our kids all fight I think and I do think a lot of it is re testing the pecking order and I just not sure it would do to have the younger bullying the older one in the long term a little shove directly related to a bite might put him in his place
But I fully aware I will be told Aibu to have told her this