You may not be able to prevent yourself from picking up bed bugs somewhere random, but you can control who comes into your home.
If a friend of your child comes to spend the night, wash the bedding that they slept on and vacuum around their bed. This will help to remove bed bugs before they get a chance to nest.
High traffic areas are most likely where bed bugs will be spread: places like homeless shelters and halfway homes generally have bed bugs. If someone coming to your home has been exposed to these locations, consider that they may unknowingly carry bed bugs with them.
Many cases we see are from people allowing someone to come into their home and stay for a period of time.