you cant leave your kid at that instant kasi attach pa siya sa parents or sa yaya, parang the kid would feel alone pag iniwan siya, or the kid will feel na ayaw sa kanya kaya iiyak siya agad pag ala yung parent of yaya sa tabi niya, what i could suggest is try to leave them at home muna, like if they watch TV(barney is good) he will start to sing and dance with barney, then at school when the kids starts playing he will start to play with them kasi familiar siya sa barney(its a barney world now) but if you plan to leave them in the TV make sure that theres a yaya that would look over the kid, even from afar, basta naklikita siya. the kid is still uncomfortable with the new environment thats why he is still apprehensive in mingling with other kids, but dont beat or hit them, try to talk with the kid firt, ok yun me reward yung bata