First, it depends on the climate of the child's family. If the family are all good, as a rule, the child is very communicative, active and friendly. If, however, have the opposite situation, the child is withdrawn and unsociable. Then you should start with building relationships between family members and need to communicate with the child. Need to find out the reasons for his reluctance to go to daycare and explain to him why this is necessary.
Second, in any group there are leaders. Children often try to be friends and to be good peers, which teachers can Express sympathy. In this case, the child may have bad relations with such leaders, or he can not make friends with them. Should explain to the child that the relationship can improve and praise him in the things that he's good at it. Maybe advise him to show his skills in kindergarten, he was able to make friends with other guys.
The situation has not changed? Then it is necessary to communicate with the tutor. If the group is large, the worker of a kindergarten, it is difficult to restrain the aggressive and arrogant behavior of the children. This is part of his duties, but is possible.
Alternatively, it is possible to communicate with the parents of the child who is hurting the baby. Ask them to talk with their child.
It will be good if from an early age the child will communicate with children their own age: family or cousins and sisters. Then it will be easier to find common language with children in kindergarten, because he will have developed communication skills, will develop a certain pattern of behavior.
But we must not forget that conflict situations can not be avoided. It would be better to explain to the child that in life stuff happens and sometimes rude communication or the rejection of friendship is not to be taken lightly, and should turn a blind eye. After all, everyone is different, with its own characteristics. The sooner he realizes this, the easier it will be to continue to build relationships in the team.