The child gets used to sleep with parents and will be afraid to sleep in their absence.
The it is more senior, the it is more difficult to transfer it to the certain room.
Besides, sexual intercourse of parents can frighten the child, he will not understand that occurs, and will be frightened.
Will seem to parents that the child sleeps, but children's psychiatrists claim that often the child wakes up and lies silently in fear, and parents of it do not notice.
However do not think that risk to frighten the child or to make it too dependent on parents so it is great..