The child should know or be able to find the emergency numbers. If an unforeseen situation arises, tell the parents, relatives, neighbors about the problem. The baby should use the communication tools safely, be able to charge them. It is necessary to convince the children to answer phone calls, even if the dad and mom call every half hour . The child should not open the door so that they do not talk to him. Parents and other close people should leave and open the door when leaving home. It is necessary to explain to the child that you can not leave the house in the absence of parents, the option of installing an internal lock is ideal. In this case, the child will not be able to leave the house without your permission.