The art & science of asking questions is the the source of all knowledge" - Thomas Berger

I am buying a new mattress to replace my existing mattress which are infested with bed bugs. What should I look out for?

First of all it is important that you discard away the infested mattress.  Next, you need to ensure that there are no other areas at your home which are infested, meaning having a “bugs-free” home before you bring in a new mattress. Otherwise, it does not really solve the problem.  Your new mattress will eventually be infested again.  Bed bugs survive on blood and will can detect where we are through our body heat.  For ways to get rid of bed bugs, you may need to speak to your friendly pest control company.