If your house or apartment was built prior to 2014, odds are that it doesn’t have the new “Tamper-resistant” electrical outlets and will need to be baby proofed. Tamper-resistant receptacles have spring-loaded shutters that automatically close when not in use. Force must be applied to both openings at the same time to open the shutters. You can tell if you already have “Tamper-resistant” outlets by either the internal plastic shutters or the letters TR stamped on the outside.